5/10 live NL, flopped set facing C/R on turn

[Loves Kauai]

I've been lurking on these boards for the last several months and feel like I've learned a lot from reading. I also know I have a lot of learning still to do. I'd like some opinions on this hand.

5/10 live no-limit. Hero is BB with about 1,400. Primary Villain is SB and has about 750. Villain appears to be playing pretty straightforwardly - a little loose and passive, but not tremendously so.

Pre-flop - 4 limpers to Villain, Villain completes, I check with 3 [img]/images/graemlins/club.gif[/img] 3 [img]/images/graemlins/diamond.gif[/img].

Flop ($60): 10 [img]/images/graemlins/heart.gif[/img] 6 [img]/images/graemlins/spade.gif[/img] 3 [img]/images/graemlins/spade.gif[/img]

Villain checks, Hero bets $50. I considered but rejected the idea of a C/R because (1) there was a flush draw on the board, (2) there was a possibility the flop had missed everybody except possible flush draws, and (3) I had recently shown down a hand where I bet the flop out of the blinds with TPNK on a similar board. All fold to Villain, who calls.

Turn ($160): 7 [img]/images/graemlins/diamond.gif[/img]

SB checks, Hero bets $100, Villain C/R and makes it $400 to go.

What's your move? What range of hands do you put Villain on? Anybody play the earlier streets differently?

Thanks!