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Try this converter:
http://www.neildewhurst.com/hand-converter/
..or if you already are, with some better settings.
He's certainly representing top or second set, but he could also be semi-bluffing. There's a small chance he's trying to push you off a biggish hand or even thinking he is value-betting with top two, as bet-3-betting the flop would scare almost anything as that would look like a set. You do have to take your image into account here.
My reason for folding would be that the 1800 bet totally commits you, and he knows it.
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Is it a common play for someone to bet out with a big set and then slow down? I don't see why the villian wouldn't stick in a third raise on the flop w/ the set. Why wait to check-raise on the turn with a set of aces or queens?
That's why I'm thinking the turn check-raise maybe some sort of semi-bluff. Or maybe he just wants it to look like a semi-bluff [img]/images/graemlins/wink.gif[/img] If he really has the big set you have got to give him kudos for a savvy play.