Cannondale 27.new&3 other good bikes

I have a Cannondale 27 5 disc brake mtn bik3 it goes for 700 new I bent the original back rim so I put a giant 700 series I n rear cause that's all I had it's worth 200..I'm willing to let bike go for 400 it's still in new condition with disc brakes ..the giant rim isn't disc but the...