tough turn descision considering I don't have a line for the river

[yuri]

***** PokerChamps Hand History for Game 198653299 *****
NL $10/$20 Texas Hold'em - Monday, April 16, 21:11:14 GMT 2007
Table Boron 03 6-max (Real Money)
Seat 6 is the button
Total number of active players : 6
Seat 1: samdonk20 ( $1,930 )
Seat 2: HERO ( $3,702 )
Seat 3: pot is back ( $4,153.23 )
Seat 4: RossG ( $1,796 )
Seat 5: Galactus ( $2,279 )
Seat 6: -secret- ( $4,358.50 )
samdonk20 posts small blind [$10]
HERO posts big blind [$20]
** Dealing down cards **
Dealt to HERO [ 7d, 6c ]
pot is back calls [$20]
RossG folds
Galactus folds
-secret- folds
samdonk20 folds
HERO checks
** Dealing Flop ** [ 8c, Ts, 9s ]
HERO bets [$40]
pot is back raises to [$170]
HERO calls [$130]
** Dealing Turn ** [ Kc ]
HERO checks
pot is back bets [$560]

HERO???

Villain: VPIP 28 PFR: 7 AF: 2.44
Also he usually plays his hands more with pot control and I've never seem him overbet like this before. Also the chance that he has some kind of big draw is pretty small.
He either has a set or the nut straight here but I don't have a % range for this.

I actually folded here because I had no line for the river with scare cards that could fall on the river and felt like I would always get outplayed on the river here with him having position.

One of my first posts so I hope that I don't get ranted for being weak because I'm not.