Call of Duty:Modern Warfare 2

WyndellMac said
Just got through with a 10 hour marathon.

1328 kills/678 deaths. 1.72 kd. 22 kill streak

Whats your fav gun???

I won't have the game for another day or two.
What gun should I use when I first start up multiplayer matches???
What is the best perks to get at first???