do you have any reads on him . What are his stats ? does he always cbet his preflop raises i.e cbet=100% 2/3 of the time he's betting with air cbet %<45 he betting with a hand . Does he play most of his Aces ? i.e A2 and A3 both give him a gutshot, and depending how aggressive he is he may be doing this with AK AQ thinking the flop will have missed you and that he most likely still has the best cards.
I think with your particular bankroll restrictions that without reads I'd probably fold as this guy looks like hes willing to stack off and I'd be looking to see a cheap showdown as we might not even have top pair.
Another thing you want to be looking out for is your opponents betting patterns. Does he normally pot his good hands to try and build a pot or half pot them to get people to carry on. Or does he bet pot when he has nothing and half pot when he has a hand. These are things you'll start to pick up on by playing less tables initially and then as you get more experienced you'll subconsciously start to pick up on these details and associate different styles to people automatically purely by experience and gut feel . The gut feel though comes from actually having put the time in looking whats happening by playing less tables. You can also pick these traits up by going through your showdown historys in a database like PT or HEM which when you log a large number of hands on a player gets you a good read on how they play .