Don't call me weak tight

[smacksoup]

No reads on villian, early orbit at the table.

Party Poker 5/10 Hold'em (6 max, 6 handed) converter

Preflop: Hero is BB with A[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero 3-bets</font>, CO calls.

Flop: (6.40 SB) 3[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, CO calls.

Turn: (4.20 BB) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>

i felt like checking here oop on the turn was a good play, because a) there are very few free cards i am worried about (aces and kings are usually good for ME here) b) give him a chance to bluff c) lose less if i am behind to a J or pp that he wants to raise d) he may fear my c/r and give me a free card with a better hand

good play? bad play?