Live 2/5 Wynn Hand Deepstacked

Villain (~$1500) in this hand has position on me. I have him covered. I am relatively new to the table, but so far I have gathered that Villain is trying to play well, but may be new to live poker. He looks back at his cards like 10 times in each hand and can be read like a book. I have been playing tight so far and have not gotten out of line.

EP limps

Hero raises to $30 with --

Villain checks his hole cards about 3 times and very nervously makes it $60 to go. I put him on a big hand. Probably AA, KK, or QQ so I call.

Flop ($128) 3 [img]/images/graemlins/heart.gif[/img]6 [img]/images/graemlins/spade.gif[/img]8 [img]/images/graemlins/heart.gif[/img]

I check

Villain nervously bets $50

I call

Turn ($228) 3 [img]/images/graemlins/heart.gif[/img]6 [img]/images/graemlins/spade.gif[/img]8 [img]/images/graemlins/heart.gif[/img]2 [img]/images/graemlins/spade.gif[/img]

I check

Villain bets $100

I call

River ($428) 3 [img]/images/graemlins/heart.gif[/img]6 [img]/images/graemlins/spade.gif[/img]8 [img]/images/graemlins/heart.gif[/img]2 [img]/images/graemlins/spade.gif[/img]A [img]/images/graemlins/club.gif[/img]

I lead out for $300

What do you put me on?
Would you fold KK or QQ here if you were Villain?
If you have a strong read that villain has KK which for hypothetical sake, we will say is the best hand, would you bet the river, and if so, how much?