I paid $350 for mine. plastics were with it, but not good enough to resell for much. tank had some rust. it was not running, but overall was ok. I've got some odds and ends parts which might earn me a little bit to offset the $, but honestly not counting on much.
this pic is what I got to after stripping all the parts off. I replaced the front end with a ZRX 1100 front end I already had. I replaced the rear wheel with a meanstreak which I already had.
In some ways you save some time because this one is already stripped. as long as all the pieces are there which you want to use, you might consider it worth a few hours of your time not to have to get it to this point. I would not pay anywhere near 800 for that bike at the point the seller has it. that seat has to go and be replaced by something that looks nice. the headlight/brackets is not there yet. the rear brake/running light is crap. turn signals added back on. I'd bet money you'll easily spend about a grand getting this to what you want it to be. I'm on that same kind of track. the second pic is a mock up of what I want to get to.