25/50, trips aces facing river raise

[BilleTheVision]

Villain is a very good player. I know that he is playing marginal holdings OOP but I don't think I've seen him cold call w/ Ax before. I got confused during this hand b/c I didn't know if he could have a worse ace in this spot but I still felt like I needed to play it like he could. Also, I think that king might be an interesting card. Would he really take this line w/ AK and would really a lower FH push river when AK is a big part of my range?

What do you like my line here and what is my action on the river?

No-Limit Hold'em, $ BB (10 handed) internettexasholdem.com

UTG+2 ($4825)
MP1 ($5140)
Hero ($5170)
MP3 ($5020)
CO ($5627)
Button ($6319.50)
SB ($825)
BB ($8655)
UTG ($8675)
UTG+1 ($5250)

Preflop: Hero is MP2 with A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $25.
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to $175</font>, <font color="#666666">4 folds</font>, BB calls $125.

Flop: ($375) 4[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $270</font>, BB calls $270.

Turn: ($915) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $699</font>, BB calls $699.

River: ($2313) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $1850</font>, <font color="#CC3333">BB raises to $4150</font>.

Final Pot: $8313

EDIT: Added some additional thoughts...

[MDMA]

Fold fast.

[ggbman]

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Fold fast.

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