I forgot, the model # doesn't tell me much... serial #?
I guess if you didn't buy it in the past year, it doesn't have the 6 Gbps drive feature. In which case, this is the one you would want:
http://eshop.macsales.com/shop/inter...3G_Solid_State
Honestly though, the Crucial M4s are on sale right now, so even though they might not run at their fastest speeds, they are the best bang for the buck right now, and I would highly recommend them.
Incase you're bored, here is my writeup/review of it:
http://blog.ashuc.com/apple-macbook-...timate-laptop/