I almost popped him p/f but decided I wanted to play a small pot with him. Then when he checked the flop its seemed really out of character for him not to C/B so I thought he may of flopped a big hand. which is why I checked.
So instead of a 150-200 bet on the flop or turn you're now looking at 400 on the river?!?!!?? Only hand that he could have that's a monster would be pocket queens or possibly 8s (would he pf-raise with pocket 8s from UTG?) but you don't know b/c you passed up 2 streets to bet and find out. A BASIC rule in fast tourneys is "IF HE CHECKS - YOU BET" - it's automatic and has extremely few exceptions! You can steal no pots or get any information by checking thru and giving up free cards. If he ck-raises you fold and if he just calls he will most often ck on the turn and THEN you can play for a small pot and ck it thru. Once that Ten hits the river you're ahead most of the time but if he bets you just call - no way I would fold a set for that amount.
And forget the re-pop preflop - TT vs a tighty from UTG is strickly a calling hand. You're hoping he has AA, KK and you flop a set or AK and missed the board so you can steal it from position. A re-raise preflop just open the door for him to go over the top huge and force you out without seeing the flop - mistake imo.