Music games:
DM + GF, preferrably sessionable, Pop'n, IIDX. e-Amuse would be a HUGE selling point for me on those.
Fighting games:
SF Alpha 3, Melty Blood
Flat rate? Wins ANY DAY.
Community Events? The niche group that plays together stays together, so yessum.
I'd travel anywhere within 10-20 miles.
Food/Drink? Definitely yes on drink, preferrably non-sodas like the -Ades and energy drinks, but not-so-much on foods. I completely lose appetite if I'm doing stamina games like DDR or DM, so maybe small pre-packaged foods like chips or something would be good... unless you want to steal TGA's cook and bring them over here.
Wi-Fi/PCs? Not really. I imagine that most of the people who would show up to an arcade like this would probably have good connections/computers at home to play on, so I doubt they would see much use.
Console games? GH/RB or some obscure imports.
If something comes outta this, I want to know ASAP. I'm always cool with donating music game repair skills or artwork if you need them. :P