weird river spot with nut flush

[jfish]

villain is the_dal_kid pretty nitty like 17/11, but hes aggro and decent postflop. im having trouble putting him on a hand range aside from {QJ, 99, bluffs}. knowing that, is it better to shove river, c/c or maybe c/f?


Full Tilt Poker - No Limit Hold'em Cash Game - $10/$20 Blinds - 5 Players - (LegoPoker HH Converter)

SB: $2,904.40
Hero (BB): $2,558.00
UTG: $616.00
CO: $3,174.00
BTN: $1,930.00

Preflop: Hero is dealt A[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/spade.gif[/img] (5 Players)
UTG folds, <font color="red">CO raises to $70.00</font>, 2 folds, Hero calls $50.00

Flop: ($150) K[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, CO checks

Turn: ($150) 9[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $120.00</font>, <font color="red">CO raises to $375.00</font>, <font color="red">Hero raises to $750.00</font>, CO calls $375.00

River: ($1650) K[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero ?</font>