$6,5 I flop 2 pair from the big blind!

[Lion King]

But I'm kinda confused now. UTG+1 is a donkey, but sb has played a pretty solid game so far.

I am not really afraid of utg+1's hand here and I would have definately called if sb would have folded. But now sb calls....what is best? Do we fold or shove and what range can I put sb on?

PokerStars No-Limit Hold'em Tourney, Big Blind is t30 (8 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop

Hero (t1855)
UTG (t1688)
UTG+1 (t1855)
MP1 (t720)
MP2 (t1470)
CO (t3137)
Button (t1565)
SB (t1210)

Preflop: Hero is BB with T[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls t30, <font color="#666666">3 folds</font>, SB completes, Hero checks.

Flop: (t90) T[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets t90</font>, <font color="#CC3333">MP1 raises to t690</font>, SB calls t690, Hero ..?