KK hand on ace-high board

[DavidC]

5-5 nlhe, live game, player to my left is very passive preflop, slightly loose, likes to cold-call me with A9s (which isn't too bad considering that I like to raise with KQo), call the flop with middle pair and check to the river in position.

There's maybe 5-7 players, and the game's been pretty loose-passive in the last few hours, with most flops being 4-ways and unraised. There's still action on the flop though, and people do make moves (not generally the villain in this hand, though, he's quite passive). I'm chip leader with maybe 3500 in chips, and villain is on my direct left, in UTG, with 800.

Villain may be slightly on tilt, due to recently losing a hand, but i'm not sure.

Villain blind-raises utg, before cards are dealt, to 20. It's folded to me, and I raise him to $80, he re-raises to 200 and I call.

Flop is AT4 rainbow. Heads-up, 200. I bet 200, he calls. 600 in the pot.

Turn is a 6. I bet 100 and he pushes for 300 more. Hero?

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2 questions:

1) Am I finished when he calls the 200 on the flop?
2) Should I have pushed preflop?
3) Can I call the turn push?
4) Should I have bet 100 on the turn?
5) Should I have bet 200 on the flop?

So in other words... what do you think of the hand? [img]/images/graemlins/smile.gif[/img]

Villain is an experienced player who is capable of making a move.