$55: Middle pair and flush draw (Blinds battle)

[Taraz]

I meant to raise to 150 on the flop, but I think I botched this hand anyway. Should I have checked the turn? How strong do you play this?

Party Poker No-Limit Hold'em Tourney, Big Blind is t50 (9 handed) converter

CO (t795)
Button (t1400)
SB (t855)
Hero (t930)
UTG (t1355)
UTG+1 (t565)
MP1 (t2078)
MP2 (t1110)
MP3 (t912)

Preflop: Hero is BB with 7[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/club.gif[/img].
<font color="#666666">7 folds</font>, SB completes, Hero checks.

Flop: (t100) K[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t80</font>, <font color="#CC3333">Hero raises to t250</font>, SB calls t170.

Turn: (t600) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets t250, SB raises to t555 all-in </font>, Hero calls t305.