I think it will go down to what perks i like the most, i rush but i also hold down an area the nets me alot of kills.
I think i will typicaly run 4 perks
Ghost,coldblooded,engineer and dead silence that leaves me with a primary, 2 attachments, combat axe and a flash bang to make 10
But this could change due to the amount of explosive items in the game Hunterkiller,Hellstorm missile, constant grenades with scavenger, Warmachine,semtex, Xbow,claymores,bouncing bettys, rcxd, grenade launchers- you get where im going
So this might mean flakjacket is a must for me, therefore i will have to add that as well and take out the Combat axe and flash bang (but i love the Combate Axe!!!)
So maybe i will have to run Flakjacket,ghost,coldblooded and deadsilence so i cant run my same setup.
But then this will leave me vulnerable to motion grenades and shock charges
( since Engineer would have delayed the latter and counterd the former)
Basicaly i want a class that allows me to focus purely on gun on gun gameplay without to many hinderances or distractions, either way with these two types of setups my only real problem will be Air scorestreak rewards.
But there normally is a building to hide in somewhere, and if thats the only thing that can stop me kicking ass, i can deal with that 
Or maybe ill run Ghost,flakjacket,Engineer and dead silence. All depends on how the MMS, target finder ect are usefull they are to other players before i will know this.
I dont think my gamestyle will change to much, but making my Ultimate KICK ASS CLASS will be a $hit load of FUN!!!!!!!!!!!!!!!!