Well mines not 100% completed yet but its getting up there.
Killer Instinct cabinet at auction (monitor doesnt work and no game board) $78
Computer bought off E-bay (Pentium D 2.8 GHZ, 3.25 GB Ram, 250 GB HD, NVidia 8400GS - hate this card) $420
Klipsch Promedia 2.1 off E-bay $88
Toshiba 27" Flat-screen CRT found on Craigslist w/component inputs (that consequently are useless at this point due to video card)$150
Tools/supplies such as paint, bondo, sanding pads, marquee light from Lowes $136
2P control panel from Arcades R Us w/ upgraded spinner and plexi overlay (havent received it yet - last major piece) - not sure if I should post cost
Rom set $40
Smartstrip $40
Winzip software (wouldnt have purchased but for this project) $30
T-molding $16
Marquee (not yet ordered) $30
DVI to component adapter (which turned out to be worthless - see comments about NVidia card) $18
Maximus Arcade (not activated yet though) $25
Total cost $1,071 without adding in control panel cost but I'm sure you can ballpark that one.
Bottom line is I think I'll end up about $100 over budget cost. Plus taking me WAY more time than originally anticipated but I do enjoy it (think the wife is about sick of it though - hehe).