Trips becomes straight, river action?

[ddubois]

No Limit Hold'em Cash Game
$5/$10 Blinds
6 Players - (LegoPoker Hand History Converter)

Hero: $2,675.75
southside1: $985.00
Give_A_Ratz: $1,099.00
b4udiwllfku: $200.75
jimmyhat1000: $1,000.00
belVolo: $2,253.65

Preflop: Hero is dealt 6[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/heart.gif[/img] (6 Players)
Give_A_Ratz folds, b4udiwllfku folds, jimmyhat1000 folds, <font color="red">belVolo raises to $30.00</font>, <font color="red">Hero raises to $125.00</font>, southside1 folds, belVolo calls $95.00

Flop: ($260) 7[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $185.00</font>, belVolo calls $185.00

Turn: ($630) 5[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $515.00</font>, belVolo calls $515.00

River: ($1660) 3[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero ?</font>

What do you put villain on? Seems like AA or KK or a 7x would have popped me on the flop. Is this a stubborn QQ-TT?

What's my line? I'm guessing the two most viable options are 1) shove and pray for a hero call, or 2) bet/call like 800, because he probably can't call a shove? Villain's AF is under 2.0, so I don't think a tiny bet to induce a bluff raise is particularly good idea, nor does check-raising seem logical, for the same reason - he's just going to check behind any overpair.