1k at most? That would be my top offer. Depending what all works and doesn't, PF, etc.. You should be able to part it out for 1k again depending.

Good luck either way!

If you can't power it up and see if the CPU, monitor, sound board, driver board, neon are all working, I'd knock off at least $500 right off the top. Be sure to inspect that all parts are there and that you aren't missing a Prism card, audio board, or driver board. Adjust up/down for condition from there. Pay attention to missing playfield parts and figures/toys. Check that the flipper buttons are not damaged as they are hard to find.

With so little information on what is wrong with it, a value is very hard to quantify. A P2K can be very expensive to fix in that kind of condition.

If you do get it and need parts/service, Rob (boryguard) here is the guy to talk to. I can repair them as well, but Rob is more willing than me

Honestly I would take RFM over SWep1 any day.
However if the PF is in very good shape (including everything on it) I would be concerned about the condition of the CRT.

Now in a worst case scenario Pinbox is a thing and then you are replacing the CPU, soundcard, and can use an LCD screen.

So you wouldn't be dead in the water, just investing another 1k so unless you are given solid reason to believe the CPU and CRT are good I would factor that potential cost into the buy price.