Would you drop bottom set?

[jen]

NL 10-20.

Me: 2k
SB: 2.5k, LAG, knows how to play and is extremely aggressive -- too aggressive for optimal $$$ though.
BB: 2k, seeming TAG. I had seen him show one hand so far, and the hand was as advertised. He seems to play reasonably tightly.
MP: 1k

I limped w/5 [img]/images/graemlins/spade.gif[/img]5 [img]/images/graemlins/club.gif[/img], MP called, MP+1 called. SB raised to 100, BB called, I called, MP called, MP+1 folded.

Flop: [J [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img]5 [img]/images/graemlins/heart.gif[/img]]

SB bet pot (~$430). SB went all-in.

Call or fold here, and was it close?