Going that deep in the Brawn tree, you have to pick come at me bro. It’s the only form of damage mitigation you have that actually works, and its full heal at a touch of a button. Its invaluable IMO.
If I were you, I would rather use a COM that boosts your survivability than one that allows you to gunzerk for longer: without Moxxi healing, you will have to be careful anyway, so managing your gunzerk will come naturally.
As Gulf said, I’m the Juggernaut is probably Sal’s worst skill… its effects are almost impossible to perceive.
A Vitality relic (or blood relic) and adaptive shield are invaluable: increasing your health makes your regen more efficient since they are % based.
My brawn tree would look like this: http://bl2skills.com/gunzerker.html#000000000000000000000055205003051
I personally like the Beast COM: the increased health and health regen (through sexy T-rex) are a good help, though a Legendary Titan is also a very solid choice. If you find you have no real problems surviving, I suggest a Renegade COM for some much needed damage boost.