I have been quite lucky selling selling Pinarellos on ebay, for the first treviso I sold ,I got over $1000 (super record, decals flacking badly) , the second, sold recently for $860 (campagnolo victory panto, decals replaced).The decals on yours are in excellent condition, but being equipped with shimano I think a buy it now of $750 , as you suggested , would be fair and the bike should go quickly. I would suggest that you only put a buy it now, no starting price, no reserve. People will just wait till the end to get a better deal when they could pay the $750. Just my opinion, I hope you will get what you want for it.