What board are you using? Reason I ask is you can get SATA II or SATA III SSD's. Also what do you want to use it for in addition to your Windows install?
I would wait for a while until next new batch of SSD's are released, ie Intel G3, Crucial C400 etc...
Ok, but then if I wait for them, and reviews of them, I will then be told to wait for the next-gen and so on and so forth...
There will always be something better around the corner where PC Tech is concerned.