I'd love to see Hard Corps and Bloodlines on it, those games aee great and haven't ever been re released. Wish they had the Japanese difficulty for Hard Corps though, since it's a little too punishing with the lack of life bar in the American release.
Other games that need to go in are Crusader of Centy, Musha, Warsong, Ranger X, Truxton, Saint Sword, Crackdown, Pulseman, Alien Soldier, Dynamite Headdy, and Wily Wars.