I would avoid that "88" at all costs. MANY things throw up a red flag to me. The seller doesn't even know how to spell "banshee". The first thing I noticed after looking at the picture is those plastics are most likely painted, and the paint won't last long with rocks, tree branches, etc. Second thing that jumped out at me is the front suspension. It has a-arms, meaning it is NOT a 1988 frame. Also, it's kind of hard to tell, but looks like t4 pipes. HARDLY "Race" pipes. It's obvious the owner knows very little about the bike he is trying to sell. With that being said, if this guy actually DID do all the work to the bike, I wouldn't trust the wiring he did for his DC conversion to run those lights.
I like the red/white 2005. You really can't go wrong buying an all stock bike. At the very least, you know that someone didn't throw a bunch of aftermarket parts on the bike, and not properly jet it.
If the choice was between one of those three bikes, I would choose the red/white 2005. That's a very good price for that bike, even though it is stock. I'd offer the guy 1800, spend $250-300 on a set of used pipes, and ride the shit out of it.