Props to Carbon for throwin' down a solid strat.
Now, for Ace's advice. I don't care if you asked for it or not.
If you don't have Jugg by round 10, you better not expect a revive.
PhD is priceless when you're shooting ray guns/explosives.
The Sickle and Mustang & Sally are extra good for dealing with monkeys.
As long as you have Gersch devices, there's really no need for Quick revive.
If you're dumping machine gun ammo at monkeys and they are still alive, you're missing. (until later rounds i.e. 30+)
Have someone stay by the MP5k. Monkeys come through here pretty heavy. Some go for PhD but most go toward Jugg.
If you're at Stamin up, you don't have many monkeys to deal with then you can set the fire trap go save another perk.
If you get a perk that you wish you didn't (either from the free perk or from your stupidity), down yourself and POOF it's gone.
If you're near monkeys, jump when they do and you'll avoid some damage.
If the monkeys do steal a perk, don't make the mistake of thinking you still have it. Believe me, I've lost PhD and not realized it and damaged myself a few times. EMBARRASSING!!!
Protect Jugg at all costs. After that, it's subjective which perks are most useful to you and your current loadout.
LOOK FORWARD TO MONKEYS!!!! MAX AMMO!!!!!!!!!!!!