QQ, multiway pot - standard?

UTG+1: Been playing with him for about 2 hours, but haven't seen anything special. Seems to make a large number of preflop calls, but plays fairly straightforward postflop.
MP1: Very tricky player that plays a lot of pots very aggressively, bluffs well and bets made hands just as well. I try to avoid him when possible.
MP2: Decent and somewhat straightforward player. Seen him limp with AQs and be aggressive with made hands postflop. Have never seen him show down a bluff for the 2 hours that I've been playing with him.

The two players to my right are TAGs, UTG+2 draws a lot.

$1-$2 NL Live, 10-handed

Approximate stacks:
Hero: $175
UTG+1: $400+
MP1: $200ish
MP2: $300+

Hero is SB with Q [img]/images/graemlins/spade.gif[/img]Q [img]/images/graemlins/club.gif[/img]

Preflop:
UTG folds, everyone else limps, Hero raises to $20, BB folds, UTG+1 calls, MP1 calls, MP2 calls, everyone else folds

Flop: ($90) A [img]/images/graemlins/heart.gif[/img]-K-x [either the K or x is a heart, I can't remember now] (4 players)
Hero...?