Isonic would be a good choice , with a 6.2 down the 101 maybe a better size . The 111 will take an 8.0 easy .
I have a 111 and I can plane in 12-13 knots with a 7.5 ,I,m 89 kg,s . I never use anything under a 6.6 on it ,22-25 knotsof wind max depending on the sea state .
Regards Martin

Heya... Slogs OK might be a bit tricky. The only board I have ridden that slogs well is an old long board with a centre-board. If you are not interested in going flat out, check out the better freeride boards (Starboard Carve, JP X-cite ride), or if you are after something a little more speedy try a super-cross board. They may slog a little better than a dedicated race board.

5.2 is pretty small. Have you considered TWO fairly new (but secondhand) modern boards (say around 2005). Should be about the samne $$ as 1 new board. 180 lb is like 80 kg in our language right? And 15-20 mph is 13-17+ knots. I'd suggest 90 litres and 120 litres - will have you covered for a lot more conditions 90 litres will be a lot better in 5.2 conditions, but still give you enough buoyancy to slog home if the wind dies...

quote:

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Originally posted by lhowemt

I want to go flat out, but don't need to be a speed demon.

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Flat out but not a speed demon Are your sails race sails Are you intending on using deidated race fins If yes to both, a dedicated race board is the answer - like the Isonic... If no to both, consider freerace and super-cross. If you are not using race sails and fins, I don't think you'll find much difference in the speed you will achieve on freerace and super-cross vs race.

If one board only, 110-115l is about right in the conditions you describe. You may find a 5.2 a little small on said board.

Super-cross board sounds like the go... Also have a look at JP free-style wave boards. These have quite a flat bottom and are pretty quick.

All in all, sounds like dedicated race/slalom boards are not really what you are looking for...