In this hobby, you could easily spend that much building a machine that looks just like a Street Fighter Two cabinet. So you'd be ahead there if you decided to MAME one of them.
That would be 6 cabinets, 6 sets of controls and parts to pilfer, and sounds like at least 3 working arcade monitors. That puts you well on the way to a killer leaf-switch MAME cab.
If you could restore the Pac-Man to perfect you would be able to fetch a grand for it
Looks like they're going for right around $900 right now for nice Pacs.
If you're a collector at all, the nostalgia of having one is worth more than the hassle of selling it on ebay.
If I had room, I'd go for it. Restore the Pac-Man, and MAME at least one of the Pole Positions and one of the SFs. But that's just me.