Flopping the nuts against two maniacs

This was a potential dream table, but I was card dead until this hand. Villain 1 is 75/25 and was down 4 buy-ins in the last hour. Villain 2 is 22/4 is 100 hands and I have otherwise no information on him. Villain 3 is a second maniac, 68/18, down 3 buy-ins in the last hour.

Both villains are aggressive, and get VERY aggressive when they are the pre-flop raiser.

Villain 1 is SB with $170.
BB has $50.
UTG has $78.
UTG+1 has $108.
UTG+2 has $120.
Villain 2 is MP1 with $104.
Hero is MP2 with $99.
LP1 has $34.
LP2 has $50.
Villain 3 is button with $168.

Hero: 6[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/club.gif[/img]

Pre-flop: Villain 2 calls $1. Hero calls $1. Villain 3 (button) raises to $3. Villain 1 calls. Villain 2 calls. Hero calls.

Flop (board: 4[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/diamond.gif[/img])

Villain 1 bets $10. Villain 2 calls $10. Hero?