Live $500NL Top Set on Nasty Flop - Checkup

[lowpockets]

Foxwoods this past weekend. Game is playing pretty well for a random 2/5 game with average stacks at the table of closer to 1K than $500. I have a little over $1k to start the hand and cover the two villians (shorties at the table).

BB - $550
UTG(HERO) - $1K
UTG+1 - $450

Pre-Flop

UTG(Hero) has 7[img]/images/graemlins/club.gif[/img]7[img]/images/graemlins/diamond.gif[/img] and raises to $25, UTG+1 Calls, all fold to BB who calls.

Pot = $77

Flop: 5[img]/images/graemlins/heart.gif[/img]6[img]/images/graemlins/spade.gif[/img]7[img]/images/graemlins/spade.gif[/img]
BB Checks, Hero bets $65, UTG raises to $175, BB calls, Hero...

Pot is $492 and its $110 for me to call. BB has like $350 behind and UTG+1 has around $250 behind.

My real question is here is to call or raise.

UTG+1 was shaking, and a taggy nit and I was over 50% sure he had the straight based on my read. BB is a poor tilty player that I played with the day before and was a lagtard.