My next board and kit

I'm on a waterlogged Naish Kailua 230L, it has served it's purpose but it seems that it is so heavy that it will not lift up and plane, I feel the force transmitted thru my body to the board but not much happens, the pull of the sail becomes extremely hard but the board just pushes thru the water.
The schools on Maui have offered me a Starboard Go 155L and a JP Funster 160L with daggerboard, supposedly not waterlogged.
Do you guys think the daggerboard is still useful and or necessary?
I am beach starting, using the harness, tack and gybe but not yet planing, in the straps or waterstarting.
My aim is to put together a lightwind setup.

I would try to get planing, that would be the ultimate goal.
Winds here are typically 10-15 knots.

Have a look at larger free ride boards of around 120 to 140 liters. Teamed up with a 7.5m or 8m sail it would get you going quite easily in those sorts of wind strengths.

^^^ Yep, the daggerboard is mainly for stability until you get on the plane, then is of no use (unless you want to 'really' tack upwind). It will also ultimately hinder your progress & make it difficult to turn, also a trip-hazard when retracted.

Both the Go & Funster are great entry-level boards, but if the Funster has a dagger, go the GO!

After the beast (220L) I moved to a JP Fun Ride 145 with an Ezzy 5.5 and now I am getting an Ezzy 6.5 and considering also a downgrade to a 120L.
It all depends how big you are and how strong is the wind.
Here in Bermuda the light wind is 10/15 but in the winter we get 20/25 and when we are lucky like this period, we can get easily get 30 ..
I can plan on my 5.5 using the harness if the wind blow up to 20, with less wind I need a bigger sail for my 145L board.
I am using 48 fin
Second year windsurfing

So my mate is on his second season of sailing on a starboard GO 150lt. Here's some observations I have in case they help:

They're bulletproof, so that really suits the beginner - you can absolutely hammer the boom into the decking and it will not even show. This may be to your advantage when buying from a wind-school. They're also surprisingly (relatively) light for all that padded decking.

It can be ridden hard if you're heavy and brazen enough. My 100kg mate hit 29kts on it the other week using a 6.7m in 20-ish knots - smashing downwind thru heavy chop! I kept waiting for the explosive 'highlight-reel' blowout but against the odds he held it down. Apparently has little self-regard for his own safety!

They can plane early if matched with a big fin...go for the high forties if you're going to sail 7+ metre sails in in light winds. If you're more in sub 75kg bracket you'll get away with less.

Super stable - you'll never have trouble up-hauling or tacking with it. It'll waterstart with enough wind (like any board)

They do turn like an shopping-trolley. But that's alright - you can still gybe it with a lunge across the width to the inside rail. Warm up your groin beforehand - it's one giant step...

Thankyou everyone for the comments it's very helpful, it looks like the Go 155L will be the one, they have sent me pictures and it looks good, I had him weigh it and it's within specifications meaning that it has not taken on water. Price is $450 US which is about the same as AUS, I could have it some time next week, we ship interisland stuff like this on a barge for quite cheap, it will cost about $45 to ship.
I would love to have a JP super lightwind but boards like that are non-existant in Hawaii, new or used and I can't really justify $2500 on a new one, how much are they going for used in Australia?
Next I have to get mast/boom/sails as all that current gear is rubbish.
I'm 198 CM and 97 KG, some days it's 5-10 knots with gusts to 15 and other days its 10-15 with gusts to 20, what sail size will I need to get planing? I'm thinking 9.5 and 8.5 respectively. Currently on a 6.1 three cam which obviously needs to be bigger.
Will I have a hard time adjusting to these radically larger sails? and should I step up incrementally with a 7.5 for instance?
Aloha

I use my GO mostly with a 7.2 Hellcat. I personally would think a 7.5-8 would be great, but I doubt going as large as a 9.5 would give you much more oomph for the hassle of the extra weight and the large mast/boom you would need to buy to rig it. I would say an 8.0 for light wind (5-20) and a 6.5 for higher wind (15-25).

I have used my GO with my 6.2, and it still gets going in very light wind. Wide boards with high volume don't need much to get on the plane, and excessively big sails would really just give you a little more speed once going in light winds at the expense of being heavier and harder to handle.

neither just get a Starboard 9-5 SUP in the silver finish, comes with 2 mast inserts. I note that you said you wanted to put together a light wind SUP, the starboard will tick all the boxes and it surfs really nicely. Also it comes with footstrap inserts. This will give you 2 types of boards in 1, the SUP which it is designed for and a sailboard (155 litres) so will do the light wind thing and will also grow with you.

Agree man, what the heck would you sell him a SUP to learn plan and harness?? Go for a 140/130, trust me, and you will speed on learning and enjoy the windsurf!

We used to have GOs and Futuras which were the first boards we would put people on for high wind planing. Not much difference between them except for the soft deck on the GO. Some people will complain about scratching their knees on Futuras while climbing back on (usually exhausted), but these were brand new boards.

Basically if you wanna climb over it like a seal get the soft deck, if you want a board that looks marginally less 'beginner' then go the normal deck.. Or flip a coin.

I thought Futuras were a more speed orientated board and more difficult to sail than a Go..?