Lee,
some time ago, I spent a happy month or so looking at all the single handers for an article I was working on for the magazine. And what I found was..... well, there are some damn good boats out there. Those that really caught the eye in the small to medium single hander range were (in no particular order)
Solo: a true classic, great active class, open meetings everywhere, hot competition..... and whilst you might be light, the Solo has the advantage that you can set it up for your weight now, then change it as you fill out past the 'piece of string' stage (which you will!!)
Streaker: The new layout on the Streaker is a winner and with a sorted rig, this is a boat that offers a great deal for not a lot. But then you also have to ask yourself the question, "where do I sail now, where do I want to be in 3 years time" - as the answers to this may well count against one of the smaller classes.
Supernova - I must admit that I have not heard anything negative specifically aimed at the Supernova. We've just had a brand new one arrive at the club and the owner seems well pleased with it. I would have to admit to be something of a Supernova fan, I think that they are a 'sweet' boat (that is not a yecky comment - what I mean by that is that in sailing the Supernova I found it well manner and vice free) that sails very well and is no slowboat in the right conditions. Again...you may be 11 stone now but when that changes......
Whatever boat you choose - go for one that you can maximise your learning on over say, the next two or three years. If you're still all skin and bones, well, stay put, if you've filled out, then the choices by then will be really exciting. I forecast back in August 2006 that the next crop of new boats would be skiff style single handers. There are two new kids on the block already, with more to come.
But if in the next two to three years you have really mastered single handers (which is no easy feat in itself) then you can sail what you like - from foiling Moths to the latest generation of lightweight singlehanders. Just don'ttry and go too far too soon. Sailing forums are full of people who will tell you that it is okay - you can sail x,y or z class at 11 stone and win. Well, maybe you can BUT.... better is to sail something that suits you and your local conditions, sharpen up on that, then look to the next step up.
Watch out for more on single handers in coming issues of DSM
D