I'm assuming you're in the US.

Just get a Hobie 16. Easy to find a decent inexpensive boat, you'll probably be able to sell it for what you paid for it also easily, (provided you don't destroy it), and parts are readily available. If you want to race there's a relatively huge following with the H16 as well.

On the flip side, I'd rather have cancer than a H16 again, but its a good tough boat to learn on. Quirky, but good.