I agree with few of what the others have said, I think when he bet 1900 on the flop and you reraise him, you should then find out how really strong he is with what he does to your raise!! Then you can make your decision if you AQ is good, but im with sickread on this one im calling the river shove!! But like I said, IMO Im reraising the flop bet and that should give you all the info you need to know about how strong he really is!!