75-150 Taj Hand

[Jeffage]

Playing in a very good 75-150 game at Taj Mahal. Full game. I open in middle position with A10o. Folded to the button, a pretty solid(and aggro) pro, who reraises. We see the flop heads up. Flop comes AJ3r(suits don't matter). I check, he bets, I call. The turn is a 7. I check, he bets, I call. The river is a 5. I check. Comments? I know the 2plus2 default here is to bet the river. But on this hand, I'm not sure...if he has AJ, AQ, AK, then I get raised (and I don't think I can pay off a raise). On the other hand, if he has something like 10-10, he is probably too smart to payoff. I probably have a 50-50 shot of getting paid off if he has a jack. And he has enough game that a bluff raise isn't entirely plausible (since he thinks I might valuebet any ace here and be capable of folding to his raise). Comments?

Jeff