I use the "Big-Un" brand.
Seriously..... just about any brand screwdriver will work. Steer away from the el' cheapo plastic handles. (some cheap plastics can actually be conductive)
A rubber gripped handle is definitely much better.
As mentioned before, the number one thing to do is make sure your ground lead is secured to the chassis AND the shank of the screwdriver. A better path to ground will help keep it from coming down the handle.
And of course if you can get a high voltage probe of sorts, by all means do so.