Ray Darr,
PDAs make great PDAs. Phones make great phones. Mixing a phone and PDA makes for a bulky phone.
It is a lot like what happens with cameras. Still Digital Cameras take great pictures and lousy video. Digital Camcorders take great video but lousy stills.
Last thought, PDAs last a lot longer than phones. It might be worth getting a really good phone and a really good PDA, it is not much extra bulk to carry around.
Take Care,
Richard