Too much?

It is early in my session at this table... villain is 20/6 over 145... is the raise too much? obviously lots of potentially ugly turn cards

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) converter

Hero ($94)
SB ($115.45)
BB ($108.10)
UTG ($269.50)
MP ($128.30)
CO ($296.41)

Preflop: Hero is Button with 7[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $0.50.
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $4</font>, <font color="#666666">1 fold</font>, BB calls $3.

Flop: ($8.50) 8[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $3</font>, <font color="#CC3333">Hero raises to $20</font>, BB folds.

Final Pot: $31.50