AK 3bet pf, frequent situation

[HumanACtor]

I know this is technically a micro stakes hand, but I feel SSNL'ers are much more adept in this situation and am interested in your input as I am just a tad lost on what my flop line should be.

No reads on Villain other than he is comfortable sitting with a 200bb stack which may be indicative of some confidence and rudimentary postflop skill.

Absolute Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $43.85
UTG+1: $97.80
CO: $20
Button: $26.50
SB: $26.95
Hero: $47.50

Pre-flop: (6 players) Hero is BB with K[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/diamond.gif[/img]
UTG calls, <font color="#cc0000">UTG+1 raises to $2</font>, CO calls, 2 folds, <font color="#cc0000">Hero raises to $8.5</font>, UTG folds, UTG+1 calls, CO folds.

Flop: 7[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] ($19.75, 2 players)
<font color="#cc0000">Hero bets $13</font>, <font color="#cc0000">UTG+1 raises to $26</font>, <font color="#cc0000">Hero raises all-in $39</font>, UTG+1 calls.