Thanks guys. Having thought about it some more I still don't really know the best river move. I guess an unknowns (though the stack size and the very fact that he's unknown leads me to believe that he's not a great player) range here is probably something like {Qx, 98, 77-TT} and I don't know if he folds the pairs enough. It seems close to neutral, so I think I like just giving up for info on his hand and to prevent myself from tilting when he snap calls something dumb. Preflop, flop and turn bets are probably enough to establish an aggro image as well.

Anyways I checked and lost to QJ.