@Paulocreed I went for the two guns on the single turret, plus I have that little shield that pops up with it. I don’t remember the names of the skill trees off the top of my head, but it was the left and right skill trees, with a couple of points in the center tree (that first skill which increases gun damage).
The beefed up single turret w/ two guns is AWESOME. It does slag damage, so it really help to kill badass enemies, since you’re not required to switch between a slag gun and a different type. I have all the upgrades possible for the single turret, minus the accuracy upgrade, and it does well for playing solo or in multiplayer. I’m a bit more of a Rambo-type player when it comes to shooters: run in with guns blazing and shoot anything that moves (which is why I’m rubbish at those Rainbow Six-style games).
I’m only at lvl 46, still working my way through the True Vault Hunter mode. I’ll probably end up getting the DLCs at some point, but the regular game is fine for now. Once I’m lvl 50, I’ll probably start using more of my gold keys, I have over 30 as it is now, although now that you mention an increase in the level cap, maybe I’ll have to wait a bit longer.