eh.. i do believe you can actually build a multi machine instead.. just get an arcade "box".. of your prefered choise of course.. check ebay or some of the sites above for those..
then get your serlf some really good arcade joysticks.. there's a whole bunch of diferent ones.. prebuilt or in pieces that you have to build yourself.. i bet you've seen the ones i mean.. check ebay if you haven't.. or those sites above too

..
get yourself a nice puter with enugh power to run most games you would like to run.. and then you can get them special arcade tvs that do 80hz on ebay to i bet..
also you can get the cps2 machine and upload to it for the true arcade experiance (
http://cps2shock.retrogames.com/ )
or get a neo-geo.. they aren't worth much these days.. and i'm 100% sure there are linkers for them..
then with the pc you can just play the rest of the stuff with mame.. so you'll have great capcom and neo-geo games and also the ability to play anything else on PC..
(i've actually considered making one of these homearcades myself)..