50/100 HU spot, somewhat boring hand

[whitelime]

Villain is Dennis Gyllner. He's much tighter than most preflop but plays pretty well postflop. I have been playing pretty aggro, have been caught bluffing a few times, but nothing crazy. Also, I think given the way the match was playing out, he would c/r JT very frequently on the flop.

FullTiltPoker Game #2545394338: Table Janell (heads up) - $50/$100 - No Limit Hold'em - 17:08:13 ET - 2007/05/30
Seat 1: whitelime ($11,200)
Seat 2: Dennis Gyllner ($21,221)
whitelime posts the small blind of $50
Dennis Gyllner posts the big blind of $100
The button is in seat #1
*** HOLE CARDS ***
Dealt to whitelime [6 [img]/images/graemlins/diamond.gif[/img] T [img]/images/graemlins/diamond.gif[/img]]
whitelime raises to $300
Dennis Gyllner calls $200
*** FLOP *** [7 [img]/images/graemlins/club.gif[/img] 8 [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/spade.gif[/img]]
Dennis Gyllner checks
whitelime bets $450
Dennis Gyllner calls $450
*** TURN *** [7 [img]/images/graemlins/club.gif[/img] 8 [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/spade.gif[/img]] [6 [img]/images/graemlins/spade.gif[/img]]
Dennis Gyllner checks
whitelime bets $1,200
Dennis Gyllner raises to $20,471, and is all in (abt 9.2k more to me)
I ?