a friend of mine bought a cocktail DIY kit of ebay I think.
here is another site,
I don't think most DIY kits come with monitors or games. you probably wouldn't want them to. they have 60 in 1, 300 in 1 or even over 3000 games in 1 kit.
you can just go MAME and install only the games you want, but that would mean you would have to buy a cheap computer. I was able to find street fighter 5 for the arcade on an emulator. pretty soon there will be ps3 games and others that will be able to be emulated.
Which is another pro to getting your own computer. a lot of those 60 in 1 kits only have old games.
I didn't build my cabinet, but I wired it up with RGB buttons and joystick and dual game switch. took the better part of two weeks, fun project. Don't think I would do RGB's again though, holy crap that was a pain in the ass. I had to re pin every wire and there were a bunch. I'm about to update the games via a MAME crediting system I built. All I need now is time to implement it. I went with ultracade for now since its pretty much the only commercially licensed old game front end/emulator. It's basically arcade legends 3 but with a lot more games, minus golden tee complete.