Slayer/BTB/All-Around
DMR
Plasma Pistol
Plasma Grenades
Thrusters
Grenadier
Explosives
Objective (large maps)
DMR
Plasma Pistol
Plasma Grenades
Thrusters
Mobility
Explosives
Objective (small maps)
AR
Magnum
Plasma Grenades
Thrusters
Mobility
Dexterity
I'm still experimenting with the AAs. Thrusters aren't that great, but they're more helpful to me than most of the other options. Regeneration Field is alright as well. I'm still not really sold on Explosives I thought the difference would be more noticeable, but it hasn't been. Mobility is a must for objective gametypes, but otherwise, I try to control the amount of sprinting I do in Slayer as it just gets me killed too much.
So many of the other perks are disappointing (although it's good that none are overpowered). Shielding sucks when you realize how it works it takes just as long for you to start to recover, but the bar just fills slightly faster. I just didn't see it making a difference. Same with Resupply when you consider that so many people chuck all their grenades before dying anyway. And Dexterity, while getting a lot of use from me at first, doesn't seem to make a huge amount of difference. Depending on your loadout, you have a number of options if you're getting fired upon while reloading anyway it's not like in CoD where you're dead instantly.