i was playing around with a variety of builds for my gunzerker. I use mainly fast-firing pistols with an occasional smg. Right now, I am running a 16/26/3 build with the focus on Rampage/gun lust. I use to play mainly Rampage/Brawn but enjoyed doing the extra damage with the gun lust tree.
I usually run with something like this with a legendary mod/ammo regen. With the boss fights, there usually isn't a lot of adds to kill so I dropped the kill skills.
I liked using money shot but found that it worked best with high-damage/low mag weapons. since I was using high-fire rate weapons, I felt like I got more out of placing those points in other things.
For any build, it's hard to pass up 'hard to kill' since it give both +hp and +hp regen. I think that helps balance survivability with the damage in the gun lust tree. If you wanted more survivability, you would put more points into incite/juggernaut and aint got time to bleed.
This is by no means definitive, its just what I've enjoyed doing/discovered for my gear/playstyle.
Fact because it's science. ==============================================