Though I don't like being limited to 10 selections in Create-a-Class, I make do with what I have and have made some pretty decent classes. Recently until I unlocked Scavenger I didn't use a perk 2 at all and that helped me out with adding more stuff to my primary and secondary.
I wanna know what your guys' favorite custom class is. What have you made so far that just absolutely helps you dominate the battlefield? Even include score streaks if you'd like.

Right now I'd say my best one right now is -
Primary: M27 - Fast mag, reflex, foregrip
Secondary: Tac 45 - no attachments
Perk 1: Lightweight
Perk 2: Scavenger
Perk 3: Dexterity
Lethal: C4
Tactical: N/A
Primary gunfighter wildcard

Scorestreaks - UAV → Hellstorm → Lightning strike

It's not the best class but it helps me get constant positive K/D games, so I like it.