Yeah it's pretty sad that the Groove is still in Clearwater's top ten most popular discs. As in, there are only seven other molds that sell more often than the Groove.
To answer the OP: Go look at the "build a bag" stickie or whatever it's called. This site is a wealth of information. Just don't give up on a disc if it doesn't work for you immediately (unless it's the Groove). I have about 70 discs that I've collected over the years, and a lot of those see little to no use. I'm currently going through them and seeing which ones work for me at my current skill level. Of the 20 that I've tested so far, 11 or 12 are destined for the MP (and I know I'm taking a loss on all of them). So don't be like me. Buy a Leopard, DX Teebird, Buzzz, and any putter and practice practice practice.