Good spot for a cold 4bet?

[recallme]

I think i am know for agressive poker, but i haven`t done a cold 4bet in these spots often.
BU is 20/17 and shotie is unknown.

Party Poker
No Limit Holdem Ring game
Blinds: $5/$10
6 players
Converter

Stack sizes:
UTG: $2968.25
UTG+1: $163
CO: $1042
Button: $2129
SB: $2460.62
Hero: $965

Pre-flop: (6 players) Hero is BB with K[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/heart.gif[/img]
UTG folds, <font color="#cc0000">UTG+1 raises to $30</font>, CO folds, <font color="#cc0000">Button raises to $125</font>, SB folds, <font color="#cc0000">Hero raises to $488</font>