KK in a Nasty Spot, r/r-ed pot

[los_toros]

This hand is a full ring hand against a (winning) 28/8/2 regular. I was planning to check flops like this but since it went three handed to the flop, I figured I mighth as well value bet.

What hands are raising this flop that I beat, and what is my line ... basically fold or shove?

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
9 players
Converter

Stack sizes:
UTG: $64.20
UTG+1: $24
MP1: $153.60
MP2: $154.40
MP3: $99
CO: $55
Button: $97
Hero: $150.40
BB: $81

Pre-flop: (9 players) Hero is SB with K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/club.gif[/img]
2 folds, MP1 calls, <font color="#cc0000">MP2 raises to $4</font>, MP3 folds, CO calls, Button folds, <font color="#cc0000">Hero raises to $18</font>, 2 folds, MP2 calls, CO calls.

Flop: Q[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/club.gif[/img] ($56, 3 players)
<font color="#cc0000">Hero bets $38</font>, <font color="#cc0000">MP2 raises to $80</font>, CO folds, Hero ...