Well, since I almost always play fighters and some of you have RPGs listed seperate, and because I'm VERY bored:

Fighting

1. Guilty Gear XX #Reload
2. Capcom Vs SNK 2
3. King of Fighters 2001
4. Street Fighter Alpha 3
5. Virtua Fighter 4
6. Dead or Alive 3
7. Street Fighter 3
8. Street Fighter II
9. King of Fighters 2003
10. King of Fighters 97

RPG

1. *space reserved for mid 2007*
2. Phantasy Star Universe
3. Phantasy Star II
4. Phantasy Star IV
5. Final Fantasy IIIj
6. Dragon Quest IV
7. Dragon Quest VIII
8. Final Fantasy V
9. Phantasy Star 1
10. Suikoden III