NL100, flop boat in unraised pot...standard?

[starkwired]

Poker Stars, $0.50/$1 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

UTG: $100
MP: $110.60
CO: $99
BTN: $88.90
SB: $54.60
Hero (BB): $99.50

Pre-Flop: 3[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/club.gif[/img] dealt to Hero (BB)
3 folds, BTN calls $1, SB calls $0.50, Hero checks

Flop: ($3) 7[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] (3 Players)
SB checks, <font color="red">Hero bets $2</font>

Villains are both semi-stations/donkish. Should I let them catch up first?