Just call here? Set of 7's

[pokerstudAA]

This was the 5th hand of a 30 person PP Tourney.....

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed)

MP1 (t985)
Hero (t1000)
MP3 (t810)
CO (t990)
Button (t1480)
SB (t970)
BB (t985)
UTG (t1000)
UTG+1 (t795)
UTG+2 (t985)

Preflop: Hero is MP2 with 7[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
UTG calls t15, UTG+1 calls t15, UTG+2 folds, MP1 folds, Hero calls t15, MP3 folds, CO calls t15, Button calls t15, SB completes, BB checks.

Flop: (t105) J[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img] <font color="blue">(7 players)</font>
SB checks, BB checks, UTG checks, UTG+1 checks, <font color="CC3333">Hero bets t50</font>, CO calls t50, Button folds, SB folds, BB folds, UTG folds, UTG+1 folds.

Turn: (t205) 4[img]/images/graemlins/diamond.gif[/img] <font color="blue">(2 players)</font>
Hero checks, CO checks.

River: (t205) 2[img]/images/graemlins/club.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">Hero bets t200</font>, <font color="CC3333">CO raises to t400</font>, <font color="CC3333">Hero raises to t800</font>, CO calls t400.

Final Pot: t1805


Both the CO and I had not played a hand at this point. So the only read I have on him is tight.

1. What about the check on the turn. I thought that might get the cut off to bet an A with a worse kicker hand. Or anything worse J10 type hand.

2. How about the reraise on the river. Should I have just called here?

3. Anyone consider laying this down at any point? What hands do you put the CO on here?