I agree with fotch. If you were willing to pay 180, then it was a fair price. If you paid 80 for it you might feel great about it but the seller would not. Seems like a reasonable deal so long as the unit works. If so, you will easily save the 180 in time and effort in a short time. Most ebay auctions for commonly sought after things heats up at the very end.
On the other hand, I know how you feel. I recently sniped a very expensive item with a relatively lowball bid, but I surprisingly won and had to spend a lot of money for something I absolutely don't need. Now I have to sell it! Maybe I will make some money for film and matboard.