Thanks for the response.
Here in Canada I've seen that EVGA 480 going for ~$200 as well, although taxes and shipping usually add another $30-$40 on to that price, which puts more distance between the used and new prices.
There are some used GTX 570's for sale locally as well, going for $200. What would a fair price be for a 480 under that condition, would you think? I'm aware that the 480 has a bad reputation for heat and noise (with good performance), and I'm wondering how much leverage that could be worth when bargaining for one