50NL - Flop overpair and lead into - call or raise?

[evagaba]

Poker Stars, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

This is a pretty common situation. I would like to make sure I am playing it right. A little table history. There was a 77/15/1 maniac at the table for about an hour that everyone was trying to stack. He did get stacked (not by villian) and left. The table action then came to a crawl.

This is about 2 orbits after the maniac left.

Villian is 21/21/2 over 40 hands. He doubled up when he had KK and a nit overplayed AK on a dry flop.

I am pretty sure this is a WA / WB situation.

Hero (BTN): $52.05
SB: $51.25
BB: $50
UTG: $100.05
MP: $51.20
CO: $22.25

Pre-Flop: T[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/spade.gif[/img] dealt to Hero (BTN)
<font color="red">UTG raises to $2</font>, 2 folds, <font color="red">Hero raises to $5</font>, 2 folds, UTG calls $3

Flop: ($10.75) 7[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">UTG bets $6</font>, Hero ?