bottom set on flop

[OneCentRob]

1.5/3 10 handed NL cash game

I'm new to the table and don't have a read on either player in the hand.

SB $159
UTG+1 $450
Hero $300 with 5 [img]/images/graemlins/spade.gif[/img] 5 [img]/images/graemlins/heart.gif[/img] in late position


MP min raises to $6 and 5 players see flop of 6 [img]/images/graemlins/spade.gif[/img] 5 [img]/images/graemlins/diamond.gif[/img] 9 [img]/images/graemlins/spade.gif[/img]

SB checks, UTG checks, UTG+1 bets $22
Hero calls, Button folds

SB pushes all in for $153.
UTG + 1 raises to £285

Now what? Any thoughts