If you could own any single Arcade Machine within your home, which one would it be?
Donkey Kong!
either a sit-in Star Wars machine or a sit-in Road Blaster machine
Have you played the cockpit version of Star Trek with a vector monitor? It is surprisingly fun!
whoah, never even heard of a star trek vector based game!
They should make a vector graphics game for every sci-fi flick. Oblivion, Star Trek Into Darkness. Oh yea!
Simpsons Arcade or Xmen. Both contain quality childhood memories for me!
Turtles in Time or one of the Metal Slug games.
I actually own it, a Neo Geo MVS. Though there are other machines I would love to own, the Neo Geo MVS is easy to manage. You just pop games in & out like any other cart base console. You just buy the machine and get games along the way.
Yea, that thing is cool!
Street Fighter 2. How effing awesome would that be?
Moon Patrol or Qbert.
Oh Moon Patrol! I loved the way the moonbuggy can hop in the low gravity and the way the wheels move up and down from the rocky surface. Someone needs to remake Moon Patrol with a more varied landscape. Now that I think of it, I played Moon Patrol in 3D by playing the Mako missions in Mass Effect.
I have Donkey Kong and Gyruss. Both are in working order but need some degree of aesthetic work done. What I want now is a 4-player Sega Hotrod to put in the center of a game room I don't have.
Ah yea, Gyruss! For so long i had forgotten about that game until I played it again in Xbox 360's Game Room. Would love to own that one.
It's a good one to have in arcade form since the joystick feels much better when circling than a typical controller/stick.
I know exactly what you mean.
Area 51
The giant Galaxy Force II sit-in machine, but realisitcally, one of those Ms. Pac-Man / Galaga combo machines would do nicely.
There was one of those Galaga/Ms.PacMan combo machines in my local movie theater, but last week, I noticed it was gone. That was the only time I wanted to play anything there. All the rest are light gun games costing a dollar a play. Yuk!
Street Fighter Alpha 3
Killer Instinct. One of these days I will own one.
I'd like to own 4-6 machines some day, but if you twist my arm it would be Street Fighter Alpha 3.
Street Fighter 2!
Either House of the Dead or Dance Dance Revolution
Star Wars Trilogy arcade game hands down. Not the retro one, the recent one:
http://www.arcade-museum.com/images/118/1181242172216.jpg
I already have it: a full size Pac-Man machine! In my garage.
Given the choice I think I'd go with the four cabinet version of Hydro Thunder. Normally I'm not real big on racing games but there's something about that one. Otherwise I'd go with the X-men arcade game, 6-player 
Sky Shark (also know as Flying Shark in Europe). Just imagine Xevious or 1943 but with WWI biplanes. This was the only arcade machine I had access to while I was in college. A game kinda becomes special when it's the only one you've got for four years.
Shadows Over Mystara. 
Yea, sweet!
Damn, good call. My runners up would be TMNT II The Arcade Game, and X-Men.
I'm with jgusw, give me a NEO GEO machine loaded with Samurai Showdown 3, King of the Fighters 96, and Neo turf Master. Yes a golf game, but it is stupidly addictive.
F-Zero AX, Mario Kart GP1&2, or Donkey Kong.
I would want to own Gravitar. They have tried to reproduce it on consoles. Just not the same thing. Control has to be precise and tight. And it looked fantastic,too.
A 6 slot SNK MVS arcade cabinet, that way I could buy and swap out any six games I want to play!
What? Stop looking at me like that! you didn't say what arcade GAME had to be in there
The original Super Mario Bros. heh It did exist! It was almost the same as the original, but had a few levels taken from SMB2j.
Marvel Vs Capcom 2