Well, the early games are truly the reason why I even own a Neo in the first place! When the Neo first came out in 1990, I was just a child in elementary school with no hope of being able to afford one...but those early games are what truly made the Neo such a compelling system. NOTHING on the Genesis and SNES could compare to the Neo games!
Anyway, here are some of my favorites which you can usually find easily and cheaply. Seek these titles out on MVS or AES:
*Magician Lord
*Nam 1975
*Top Players Golf
*Cyberlip (You're not a true gamer until you beat this on 1 credit!)
*Super Spy
*Blue's Journey
*Ninja Combat (repetitive, but still great mindless fun!)
*Baseball Stars Professional (not as good as BBS2, but still holds up pretty well)
*Sengoku 1
*Crossed Swords
*Ghost Pilots (tough 2D shooter)
*Fatal Fury 1
*King of the Monsters 1
*League Bowling
*World Heroes
*Riding Hero
These were just a list of some of my favorites. I really enjoy the early Neo games almost as much as the newer fighters. The variety was greater back then and surprisingly, the older titles still hold up pretty well even today!