Blind steal from the SB. Taken too far?

[KaiShin]

So I've just recently delved into the world of 1/2 6-max. After consistently winning at .5/1 and 1/2 I've decided its time to learn 6M while my bankroll can absorb any growing pains.

This is a blind steal attempt, my first at this table. BB is pretty tight, under 30% VPIP.

Party Poker 1/2 Hold'em (6 max, 5 handed) converter

Preflop: Hero is SB with 5[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">BB 3-bets</font>, Hero calls.

Flop: (6 SB) J[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, BB checks.

Turn: (3 BB) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">BB raises</font>, Hero ???