Flopped the 2nd nut straight vs imposing 2+2 player

[Garland]

The opposing CO player is a 2+2er. The UTG+1 all-in is an unknown.

CO player stats: 145 hands 27.59 VP$IP and 7.59% PF Raise percentage, but more importantly he seems to play his hands well from the limited time I've seen him.

What's the final say?

All comments appreciated.

Garland

Party Poker No-Limit Hold'em, $ Garland (10 handed) converter

UTG+1 ($233.75)
UTG+2 ($582)
MP1 ($566.05)
MP2 ($600)
MP3 ($1456.7)
CO ($604.8)
Button ($184)
SB ($594)
Garland ($600)
UTG ($671.5)

Preflop: Garland is BB with 7[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $3.
<font color="#666666">1 fold</font>, UTG+1 calls $6, <font color="#666666">2 folds</font>, MP2 calls $6, MP3 calls $6, CO calls $6, <font color="#666666">2 folds</font>, Garland checks.

Flop: ($33) T[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Garland bets $28</font>, <font color="#CC3333">UTG+1 raises to $80</font>, MP2 folds, MP3 folds, CO calls $80, <font color="#CC3333">Garland raises to $220</font>, UTG+1 calls $225.75 (All-In), <font color="#CC3333">CO raises $598.80 (All-In)</font>, Garland ????