Hmm, well, 2 things: first, I think these shoes run small (thehuangfamily has some on ebay and it says that a 39 best fits a size 7.5 or 8, I don't know your size but they might fit differently unless you've already tried them on) and second, I've heard from some here that the round logo area on the shoe is NOT comfortable when wearing them for any length of time.
If you're still interested though, I think $650-$700 apiece is decent based on condition (and that same pair in blue is on ebay as a BIN for $980). I don't know what the retail was though.