Man, How many machines do you have now?
MKII , UMK3, MsPacman, Revolution X, TMNT, Sportstation, Faster than Speed so..... seven. MsPac is my wife's so technically 6

Before I had all fighting games, then traded some for the racing cab, then sold and traded others to have a more well rounded arcade. Probably wont keep UMK3; and TMNT is worth so much I might have a hard time convincing myself to keep it. I'd love to get a side by side racing cab, like Initial D or Wangan Maximum Tune. Will probably end up picking up some generic Dynamos to house some multigames (not MAME) and will definitely get a nice 4 or 6 slot NeoGeo. My MAME cab is probably going to get the kibosh soon and get reverted to a dedicated MK4. I want to move the MAME guts into a generic cab instead of a dedicated one. Would love to get a dedicated open ice cab and an arkanoid.
Recent sells include my 2 player dedicated Blitz (sold to fund the sportstation purchase), my 60 in 1 Galaga (just the cab, still have the 60 in 1 board), Killer instinct was traded for Rev X + Cash, Mortal Kombat 1 was traded for the Rampage cab + cash. Rampage was reverted back to TMNT.
Not pictured TMNT and UMK3

Sportstation is actually behind the faster than speed seat, and UMK3 is between MK2 and MsPacman right now.