i'm looking for a two-way stylus pen for my new panasonic cf-18 toughbook (windows tablet pc version, wacom digitizer screen) -- with a digitizer tip at one end, a ballpoint at the other. I guess i'm spoiled by the convenience of true-tip pen caps, which turn a ballpoint pen into a two-headed stylus for my (touchscreen) ipaq pda. I'm using a panasonic stylus pen (cf-vnp005u), which is barely OK. panasonic brand stylus pens seem to have limited options. Am I stuck with them? Or is there some way to find out which brands/models of digitizer stylus pens are compatible with the cf-18 -- other than just buy and pray?