So far I have Mortal Kombat 2, Ultimate Mortal Kombat 3 (formerly Mk3 prior to upgrade), Soul Calibur II, Marvel vs Capcom, Virtua Cop 2, and Raiden 2. I would love to get my hands on some more SNK/Neo Geo fighters as well as some more shmups. I've also been looking for the old Capcom Alien vs Predator beat 'em up for a long time. I also have an irrational desire to find a Primal Rage arcade machine.
Here is a pic of some of my machines that I keep at my shop (the rest are at home):
![Image](http://www.antarius.com/arc.jpg)