Titan No-Limit Hold'em, $1.20 6-MAx SnG Converted by Hand coz I couldn't get the Hand Converter to work

[a BC question, I thought, but let me know if it should go in the SnG Forum]

Blinds: $75/$150

CO ($3460)
C'est Moi($2280)
SB ($2142)
BB ($1117)

Preflop: I'm on the Button with:,

1 fold, I Raise $450, 1 fold, BB calls $450

BB is 54/7 after 41 hands. His MO is to limp or call preflop, then make half-pot sized stabs on each street. Takes it down often when opponents fold, but rolls over in face of anyone playing back with big reraises/shoves.

Flop: ($975) ,, (3 players)

zomg! I am haz da Noooots!...errm...well almost. only concern is a runner-runner straight-flush.

Dilemma is how to maximise the situation. If he gets wind of that Ace, it's finito.

BB bets $150,

so far so good.

I call $150

Turn: ($1275)

(2 players)

BB Checks,

Well, it's official now. However, he's not made his usual bet. I don't fear the free card, in fact I hope it gives him a full-house or a flush, so..

I check too

River: ($1275)

(2 players)

BB bets $150, and ?????