How about the ones I wasted the most time on:
Populous (absolutly without a doubt the most addictive for me)
Altered Beast (played day after day until beaten; great 2 player action)
Barbarian
Amegas (break out clone, very well done)
Rick Dangerous (jumped outta my chair nearly everytime I got killed, and actually broke a joystick over this one!) Waaaaahhhhhhhh! LOL!
OMG...there were so many....I cannot even remember them all!