bottom set, call-off?

[snugglez88]

This hand requires some background, villain is donk_on_tilt, a fairly loose, very aggressive opponent, we also talk on AIM I know that he doesn't limp 75 here, he could have suited big cards, AA (although probably not), top two pair is possible, or a set

is this a call or a fold?

Party Poker No-Limit Hold'em, $ BB (10 handed) internettexasholdem.com

CO ($1626.45)
Button ($2085.72)
SB ($9694.72)
BB ($4900)
UTG ($5321)
UTG+1 ($4732)
UTG+2 ($6964.38)
MP1 ($5522.02)
MP2 ($3575)
Hero ($7541)

Preflop: Hero is MP3 with 6[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img]. CO posts a blind of $50. SB posts a blind of $25.
UTG calls $50, <font color="#666666">4 folds</font>, Hero calls $50, CO (poster) checks, <font color="#666666">1 fold</font>, SB (poster) completes, BB checks.

Flop: ($250) 6[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG bets $225</font>, <font color="#CC3333">Hero raises to $675</font>, CO folds, SB folds, BB folds, <font color="#CC3333">UTG raises to $2000</font>, Hero calls $6816 (All-In), UTG calls $3271 (All-In).

Turn: ($13012) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players, 2 all-in)</font>

River: ($13012) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 2 all-in)</font>

Final Pot: $13012