I picked mine up for $1500 about 2 years ago fully working, but it needed a lot of cleaning, maintenance and replacement parts. I put a lot of money into really cleaning it up nice, but I tend to do that with all my pins.
The stuff that isn't as easy to fix or replace on this pin is obviously the playfield -- check the center of the playfield for any warping from overheated inserts. There are a bunch of flashers directly below artwork that covers plastic inserts and these can heat up and bubble up through the surface.
There's also a couple diverters which redirect the ball from the plastic ramp down the center, or into the mini playfield - which also has it's own diverter to send the ball down the right side. These are integral to playing the game properly since many modes take place in the upper playfield, and several combo shots are based on the ball properly being diverted to the right place at the right time. These are all pretty easy to fix, thankfully.
The big plastic ramp is now available (and stronger than ever) from Freeplay40, but just about every other plastic will be difficult to find. It's pretty rare to see them broken though, so that's a plus. There are probably a bunch of used original translites available second-hand since just about everyone has added the nice repro prototype translites from RD Reynolds. The Cliffy protectors are available (as posted above) but you have to message Cliffy directly.
Lots of fun mods available for this game too, so if you love the theme you can really make this game shine. The PinSound board is not cheap, but is an awesome upgrade to replace the music with real theme music. And people are now making LCD playfield screens with Raspberry Pi that fit the theme perfectly as a mini "TitanTron" for showing classic entrance videos, etc...
For the price, even at $2k, this game gives you a lot of bang for the buck - even more-so if you're a fan of late '80s/early '90s WWF.