Want info on my old salvage Trek bike.

[Duffy One]

This is my Trek Trail 800, I have had it for 4 years now and ride it all the time everywhere. I am thinking of repainting it, but before I do so I would like to know some things about the bike, like its purchase price, what it is worth now (and or what it would be worth in good condition), good and bad things about this model, just stuff like that. I have searched google for the bike and parts that are on the bike and have come up empty. Currently the only original stuff is the frame, forks, gear selectors and breaks. The handle bars are off a retro Stycle bike. Wheels and tires are off a Southern Cross and the headset, seat and crankset are off an unknown bike.