$25NL6max: Call for set value or 3-bet?

[Askilus]

Villian is a donk. He is loose and aggressive preflop (50/32) and is known to commit his stack with marginal hands on wet boards (AF of 6), I have 45 hands with him. I discussed this hand with skillzilla. One of us thought that this is a 3-bet preflop to make him pay to draw out on us with Ax and that sort of crap, the other that this is a call so that we don't force these holdings out the times we hit a set and we want to stack him. Who is right agains this type of player?

Party Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
6 players
Converter

Stack sizes:
UTG: $7.85
UTG+1: $14.75
CO: $42.35
Button: $18.80
SB: $50.65
Hero: $28.75

Pre-flop: (6 players) Hero is BB with 9[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/club.gif[/img]
4 folds, <font color="#cc0000">SB raises to $1</font>, Hero?

Regards,
Fredrik