50NL: How much to raise?

[RapidEvolution]

Villain is 35/0/1 over 132 hands.

I've been running 13/9/5 at the table so far

$0.25/$0.5 No Limit Holdem
8 players
Converted at weaktight.com

Stacks:
UTG (<font color="#0000cc">$34.55</font>)
UTG+1 (<font color="#0000cc">$89.45</font>)
MP1 (<font color="#0000cc">$50.00</font>)
MP2 (<font color="#0000cc">$50.40</font>)
CO (<font color="#0000cc">$19.25</font>)
Hero (<font color="#0000cc">$85.15</font>)
SB (<font color="#0000cc">$49.50</font>)
BB (<font color="#0000cc">$79.40</font>)

Pre-flop: ($0.75, 8 players) Hero is BTN 4[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/spade.gif[/img]
<font color="#777777">5 folds</font>, <font color="#cc0000">Hero raises to $1.75</font>, SB calls $1.5, BB calls $1.25

Flop: 9[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] ($5.25, 3 players)
SB checks, BB checks, <font color="#cc0000">Hero bets $3</font>, <font color="#777777">SB folds</font>, BB calls $3

The flop seems pretty innocent, so I take a poke at it. When I get called, I figure BB probably has a weak queen or something. He seems like the calling type, so I'm probably not going to fire the turn.

Turn: 2[img]/images/graemlins/club.gif[/img] ($11.25, 2 players)
BB checks, Hero checks

I pick up an open-ended straight draw. I contemplate betting, but decide against it for reasons mentioned. Plus, if I hit an ace and villain called the flop with overs, I could make some nice money.

River: A[img]/images/graemlins/club.gif[/img] ($11.25, 2 players)
<font color="#cc0000">BB bets $11.25</font>, <font color="#cc0000">Hero raises to...? </font>

There's no way he can put me on a straight here and he's suddenly betting out! Min-raise? 30? Shove? I think I suck in spots like this...