Hey i have the computer version of cod4 but pretty much the same....i use

Gun-M4

Attatchment-ACOG

Secondary-USB (idk why i just like that pistol lol)

Perks

1.Bandoleir

2.Double Tap

3. i personaly use Last Stand because im the highest rank and i got bored but its actually pretty good.

2cnd class

Gun- (Since i'm a big sniper i will tell you my favorite sniper class) M4OA3

Attatchment-no attatchment

Secondary-USB silenced

Perks

1. Claymore x2

2. UAV jammer

3. Iron Lungs

Pretty good classes try them out (there mostly good in Harcore)