I've heard nothing but good things about KOTOR, and in fact a friend of a roommate highly recommended it to me out of the blue just 2 days ago.
Star Tropics is fucking AMAZING.
Ocarina is a classic milestone in 3-d adventure gaming, introducing the great targeting system that's still used in every melee fighter ever, including GTA games.
I haven't played Luigi's Mansion yet... but I own it. I will eventually, but I'm in the middle of too many games right now.
Great score on the deal for all 4 though. Congrats.