Live 2/5nl, Deepstacked - Tough spot w/ set.

[RyanCMU]

Live 2/5 NL at the local casino. Stacks in this game get pretty deep as the max buyin is $1k, so most starting stacks are around $500-$1000, and as the game progresses its not uncommong to have a few $4,00 and $5,000 stacks.

Relavent stack sizes in this hand are as follows; Me on the button w/ $2,200, UTG w/ $3k+, and BB w/ $800.

My image at the table is very Loose and agressive. I won a very large pot at showdown w/ 53s. And I have won quite a few pots without having to showdown.

BB in this hand is a regular at the casino, however, he is pretty bad. Makes a lot of bad calldowns w/ marginal hands and plays his strong hands way to passivly as well. He has also bought in for the 3rd time now, each time for $800, and his prior two bustouts he stacked off w/ QQ on a TT4 flop in an unraised pot preflop, and in the other bustout he got KJs all in on a board of KT82. Hes bad.

The other significant player in the hand, is another regular, however, he is actually competent. He plays a pretty unimaginative game, however, he is capable of making moves.

Finally, onto the hand...

Preflop
UTG opens to $30, a MP player calls, I call on the button w/ 5[img]/images/graemlins/club.gif[/img]5[img]/images/graemlins/diamond.gif[/img], BB calls.

Flop Pot - $120ish 2[img]/images/graemlins/heart.gif[/img]5[img]/images/graemlins/spade.gif[/img]3[img]/images/graemlins/heart.gif[/img]

BB checks, UTG checks, MP checks, I bet $100, BB calls, UTG calls, MP folds.

Turn Pot - $420ish 8[img]/images/graemlins/spade.gif[/img]
BB checks, UTG checks, I bet $350, BB folds, UTG calls.

River Pot - $1,100ish 9[img]/images/graemlins/club.gif[/img]
UTG checks, I bet $700, UTG c/r's all-in, It's essentially like another $1k to me to call his river c/r.

So, do we call his river c/r? Would he really play AA or KK that slow on such a coordinated board, similarly would he really play a set like this either? Could this be AhKh AsKs AhQh AsQs? We are deep could this be like A4s, 64s, 6h7h, 6s7s?

This is probably pretty simple, I'm just looking for some help defining his range here, I knwo this is probably tough w/o specific and more detailed reads, so if the description I gave is not enough, how would you play this vs a standard TAG? What about an unknown?