$1.5 18-man: check bet or push?

[Mugpunter]

1st HH be gentle with me.... Also not sure whether 18-man SNG goes here or MTT but decided here.

10 players left, me about 5th, villain had doubled up early(99, hit set) then sat on his hands apart from a little blind stealing.

PokerStars No-Limit Hold'em Tourney, Big Blind is t150 (6 handed) Hand History converter Courtesy of PokerZion.com

BB (t2875)
UTG (t1750)
MP (t1905)
Hero (t2360)
Button (t1340)
SB (t5615)

Preflop: Hero is CO with Q[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t450</font>, <font color="#666666">2 folds</font>, BB calls t300.

Flop: (t975) 7[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

BB checks.....