My favorite still has to be either Mega Man 2 or 3. The first 3 X's were great, but once they migrated to playstation...I found them less to my liking. Just my opinion, tho. I like MM2, but found MM3 great as well, there are too many things I like about both, so I just think those 2 are the best. They had the wierdest/coolest Robot Masters, some great techno-pop, and they were just really fun to play through.