Very difficult to do any sort of appraisal without some detailed pics. If you are close enough to go see it check how the diaphragm covers line up with the scoop cut-outs....if they aren't centered then the frame is probly bent....look at every weld for hairline cracks....also indicates bent frame. The wheel may be able to be straightened, there are outfits that do that quite well, if they aren't successful they probly won't charge you but you want that mentioned up front. The forks being 'slightly bent' is like being 'slightly pregnant', they need to be replaced, or the part that is bent (the lowers may be ok), you can price them. It all depends on how hard it was hit, check the steering stops, pick the front end up and swing the bars from side to side, look for notchiness, jambs in the down tubes, scrapes on the bottoms of the pipes, sides of the mufflers, ends of pegs & bars....that'll let you know if it went down and slid.
$500 to fix seems unrealistically low but you need a complete list, maybe Sean has some good used parts on hand that would help you keep the cost down.
$4500?....way too much! Also, make sure it's not a salvage title....it's only a parts bike then.
