Middle pair push

[BZ_Zorro]

Interesting $100 Party hand, wondering if anyone else would make the same play...

I've been mixing it up maniac style for the past 50 hands or so, VPIP 38%, PFR 26% at this table. Villain sat down a few hands before so he may not know this. Also no stats.

Party Poker No-Limit Hold'em, $ BB (9 handed) converter

SB ($94.5)
BB ($100)
Hero ($196.2)
UTG+1 ($99)
MP1 ($121.95)
MP2 ($101.85)
MP3 ($103.8)
CO ($30.35)
Button ($73.8)

Preflop: Hero is UTG with T[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $0.5.
<font color="#CC3333">Hero raises to $4</font>, <font color="#CC3333">UTG+1 raises to $9</font>, <font color="#666666">7 folds</font>, Hero calls $5.

Flop: ($19.50) 3[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $6</font>, <font color="#CC3333">UTG+1 raises to $20</font>, Hero bets $181.20 (All-In)

Villain was very quick to raise. What range of possible hands would you put villain on here? Would anyone else push this?