Sonic R and Sonic CD would make this a good compilation. I enjoyed both on my old computer, but my new comp won't run them. Sonic R was a lot of fun to me. Sonic CD was just awesome, it had everything. Loop-de-loops, long stretches of running, Great level design (there are pretty much no pits), the first apperance of Amy the Hedgehog, the first apperance of Mecha-Sonic, and so many levels. The time travel mechanic was way past cool, and the special stage was one of the best. It also marked the first time a cheesy song was used for a theme, and all the music was high quality.
Oddly enough, Sonic CD was the only sonic game that wasn't made by Sonic Team.