Well i paid 2500 Canadian for an 03 K5 Last fall ad in mint condition, as far as 2000 for an 01 sounds bout right, a top end rebuild thats done before she blows is fairly cheap... price of gaskets and piston kit, those who spend 1000 or more are talking about damaged cylinders and having work done by shop, if you're any bit mecanically inclined it is an easy job
Good luck there a real blast to ride