As for price that all depends on location and market. Cole knows alot about these sleds and knows the terminology used, so have him check the following stuff, and show you what he is looking at so you can learn
The W arm in the rear suspension should be checked for cracks and welds
The track if stock needs a good looking over for missing or bad lugs
Custom Carbides don't mean good carbides, look at the for smooth edge or missing carbide
He may know how to look at the head gasket that sticks out to see if the rivet is missing out of it, if it is chances are it is missing 1 or 2 layers, so ask
Look at the drive belt, if it is new ask why, if it isn't look at both sides to see if it is shinny and burnt, one side being so and the other not is a sign the clutches are miss aligned
Look closely at the shock shafts and see if there is any shock oil on them, and to make sure there is no pitting in the shafts
Most important would be to take a compression gauge along and check all three cylinders. They should be right around 110-115 psi if stock, and tthats from a memory that doesn't serve me as good as it used to
I'm sure others will have more sugestions but this is a start, they are great sleds, and will run long past 3400 miles Maxdlx