First off I will answer the 2 handed weapon question. Personally I find there is a much larger selection of powerful 1 handed weapons in the game and that dual wielding those powerful weapons gives and advantage of 2 handed weapons (I think out of the 3 favorite 2 handed weapons of mine 2 are quarterstaffs!).
That said you haven't considered 1 other alternative for a straight up warrior and that is a monk. Early on a barbarian or berserker will feel more powerful but later on the monk gets nutty. Alot of people dis the monk saying its for powergamers but it seems like thats what your question was
