First singlehanded trapeze skiff

It depends where you sail inland. I wouldn't worry about the 600 not having a class association if you are racing at club level.
They are truly rewarding boats and a great test of boathandling. Once mastered everything else will feel easy. I would only go for a 700 or MPS if you are at one of the bigger lakes.
Running costs on a 700 or MPS are higher due to the extra rope and kite. If you are on a good size pond then either will give you a great experience. Both have pros and cons and arguably the MPS is slightly more refined but costs a lot more.

Originally posted by Dignhysailor will be a lot more expensive?!

Budget wise, maybe up to £3000 or so, depending on when I get it and what funds are like (hoping to get some work in the summer...)! Have done a bit on Assy spinnakers as well as trapezing, just not together! Did wonder about adding kite later, plainly not possible but I suppose that just = more swimming! Sounds like the options are contender or MPS then?! Only thing I suppose is that MPS will be a lot more expensive?!
(PS don't want to Further complicate but would not be interested in wooden boats (contender wise) and wouldn't want to do too much work as am v busy, just want something to go sailing/swimming in!)
There's a couple of lakes near me, not sure if they have any of the classes, might be one or two but need to find them!

Ignore which one until you decide where you'll sail.  I'm obviously a little biased owning an MPS so won't comment on the boat, but the "best" boat is the one that you can sail with others at your home club.  Both boats will be a challenge and hugely fun to learn, but you'll progress up that learning curve so so much faster if you can sail with others as they will help you over than hump.

What have you got to spend?