25/50 HU ~400 bb deep vs durrrr help

[tcorbin16]

Villian is durrrrrrrr. he and i have been playing hu over 4 tables for roughly 2 hrs. At this point in the match i think he was up maybe a few buyins, and i was making a bit of a comeback. We both have been very active preflop and postflop. He has seen me bluffraise and checkraise rivers with air.

Also durrr pretty much leads with his whole range so i can't really polarize his hand to anything exact.

Full Tilt Poker, $25/$50 NL Hold'em Cash Game, 2 Players
LeggoPoker.com - Hand History Converter

Hero (SB): $21,622
BB: $18,203.25

Pre-Flop: X X dealt to Hero (SB)
<font color="red">Hero raises to $150</font>, BB calls $100

Flop: ($300) 2[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">BB bets $250</font>, Hero calls $250

Turn: ($800) 5[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">BB bets $650</font>, Hero calls $650

River: ($2,100) 2[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">BB bets $1,650</font>, <font color="red">Hero raises to $5,950</font>, <font color="red">BB raises to $17,153.25 and is All-In</font>, Hero ....?

~11k more for me to call.

We all know how sick durrr is... what is your guys calling range for this river?

also if it makes a difference, he didnt really take too long on shoving over my raise and didnt hit the timebank, whereas i timed just a lil before raising.