Hmm... (Looks at Turbo collection consisting of 11 CD games) Let's see...
Here are my top CD games:
The Legend of Heroes - Totally awesome. I remember being fascinated by how deep the character development and relationships were, up to the point I played, anyway. Lots of fun, somewhat rare, and expensive in most cases (I got it relatively cheap).
Gate of Thunder - First of all, how can you go wrong with getting four games in one? Not only do you get the first two Bonk games and Bomberman, but the main attraction is one of the great overlooked shmups of all time. Fun, but find a good deal before buying. I got it for $50. Most go for $100 now. a$$holes.
Cosmic Fantasy 2 - This is probably stretching it, due to having not played it yet, but I bought it brand new on ebay for a fair price, and from what I've heard, I'm definitely in for a good time. Can't wait to try it out!