Interesting River Decision w/ AT

[Worm75]

Full Tilt Poker - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 6 Players - (LegoPoker Hand History Converter)

Villain is running 49/7/3.6, I just sat down at the table about 20 hnds ago, so no real hands of note.

I was thinking value town with my bet on the river, but raises like this generally mean strength here.

Do we play the hand different from the flop on, by c-bet, and then what is our line on the river?
SB: $28.45
BB: $25.00
UTG: $35.25
MP: $32.65
Hero (CO): $24.65
BTN: $17.85

Preflop: Hero is dealt A[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/diamond.gif[/img] (6 Players)
2 folds, <font color="red">Hero raises to $1.00</font>, BTN calls $1.00, 2 folds

Flop: ($2.35) 9[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, BTN checks

Turn: ($2.35) 5[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $1.45</font>, BTN calls $1.45

River: ($5.25) 2[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $3.20</font>, <font color="red">BTN raises to $7.00</font>, Hero??