River raise that's probably not a bluff

[the_dal_kid]

The guy is 20SUCKOUTZ he's unknownto me but seems to be playing relatively tight and straightforward, am I crazy for wanting to fold this??

Full Tilt Poker, $10/$20 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

BB: $2,247
Hero (UTG): $2,050
CO: $2,010
BTN: $2,631
SB: $2,671

Pre-Flop: J[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] dealt to Hero (UTG)
<font color="red">Hero raises to $70</font>, CO folds, BTN calls $70, 2 folds

Flop: ($170) T[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $120</font>, BTN calls $120

Turn: ($410) 3[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, BTN checks

River: ($410) Q[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $300</font>, <font color="red">BTN raises to $800</font>, Hero ??

Also, I was going for a C/R on the turn what do you guys think of that line?