>> What would be a realistic going price for these?
I bought a set identical to yours with decent Michelin tires on them for $560 locally. I then sold my 17" regular ones with 70% Michelin tires on them for $260 to someone who was desperate and in a bad financial situation. (My 17" tires were only a year old, well over $500 worth of tires left in them alone, but felt bad for the guy and gave the whole set away for $260.)
Just trying to give you some price points, that is all.