Facing huge river check raise with top pair........

[ArmenH]

Playing $7.50/15 deep stack on FTP. My image is a passive nit, been been check calling and check folding alot. I've shown down 3 hands thus far and each time I've had the goods. Villain in hand is Stuart Patterson, played with him before and he doesn't seem that great, kinda irratic. What is my river line here? And what do you think of my turn line?


Full Tilt Poker Game #2370580005: Table Cope (deep 6) - $7.50/$15 - No Limit Hold'em - 3:15:53 ET - 2007/05/07
Seat 1: Champalafagus ($3,216)
Seat 3: thedegeneral ($6,958)
Seat 4: Stuart Paterson ($2,496)
Seat 5: mastrblastr ($4,258)
Seat 6: David Singer ($1,723.35)
thedegeneral posts the small blind of $7.50
Stuart Paterson posts the big blind of $15
The button is in seat #1
*** HOLE CARDS ***
Dealt to Champalafagus [Ts Ah]
mastrblastr folds
David Singer folds
Champalafagus raises to $52.50
thedegeneral folds
Stuart Paterson calls $37.50
*** FLOP *** [8d 6h Ks]
Stuart Paterson checks
Champalafagus bets $89
Stuart Paterson calls $89
*** TURN *** [8d 6h Ks] [Ad]
Stuart Paterson checks
Champalafagus checks
mastrblastr: k
*** RIVER *** [8d 6h Ks Ad] [7c]
Stuart Paterson checks
Champalafagus bets $159.95
Stuart Paterson raises to $959.95
Champalafagus????????????????