You should go out and try some, different people like different types of handles. Also consider your handle shape and size, I have slightly largish hands that aren't meaty and so I tend to end wrapping my hands all the way around some screwdriver handles and having more finger to go which I don't like at all becuase my hands cramp up.
As far as personal preference: Plain Craftsman handles they just seem to fit my hand well, Klein handles are nice also, oddly the Mac hard handles are nice to despite seeming somewhat smallish and the old Craftsman industrial ones like bchee pointed out are nice as well. Also the SO 1st gen softgrips seem nice for the limited amount of time I have used them.
Screwdrivers that would be nice if I had little girly hands are: Channellocks comfort handles are really nice if I had fingers that were 3/4" shorter, SO 1st gen hard handles all my female friends think its a nice handle I just find it a pain to use something that small.
Screwdrivers that I just plain don't like using becuase they are slower and more uncomfortable than the ones I like: SO 2nd gen hard grips, I had one of the ratcheting screwdrivers and I still was going faster with a Klein becuase of the handle shape, Stanley tri-lobes, just an odd handles for really putting torque on.
Theres my list that almost guarantees I ticked somebody off. I haven't tried many of the German brands but if I find some that feel good I could see buying them.