100nl - KK preflop

[ddrstel]

Before you flame away, this isn't a BBV story and I'm not asking if i should fold preflop.

My question is should i raise in this spot, or cold call with position on the 3-bettor. This spot doesn't come up very often so i was a little unsure of how to extract the most value.

Button is playing 22/18/4 but only over 49 hands
SB is a solid player and is playing 23/18/2.7 over 284 hands

Full Tilt Poker
$0.50/$1 No Limit Hold'em Ring Game
6 Players
LegoPoker Hand Converter

<font color="black">Stack Sizes</font>
BTN: $207.75
SB: $156.85
Hero (BB): $153.95
UTG: $28.55
MP: $67.65
CO: $39

CO posts 1
<font color="black">Preflop:</font> K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img] ($2.5, 6 players)
UTG calls $1, MP folds, CO checks, <font color="red">BTN raises to $5.50</font>, <font color="red">SB raises to $19.50</font>, Hero...?