It never hurts to have several different sizes of flats heads and Phillips screwdrivers. With that said, you dont need anything fancy. I prefer something with a soft grip vs a hard grip, but other than that, most any screwdriver will work fine.

The screwdrivers you mentioned sound nice enough. There are times where I wished my screwdrivers didnt slip or a screw is stuck in really good and i end up stripping the head more than I care for. If these screwdrivers can prevent that from happening, it might be worth the investment.