I was in your boat, but I recently realized the right thing for me was to get the smallest (and cheapest) smartphone I can (palm or WM) for PIM- that way, it's always handy- and can concentrate on office app and internet experience for my next handheld device (where a bigger screen matters.)

Now I need to decide if 810 is the way to go, or wait a few more months for a (bigger, heavier, more expensive, but probably pocketable) MID device that can run Open Office.