PDA vs. PDA Phone Combo

I currently have a Dell Axim 51v, which has a nice 3.7 VGA screen.
However, I'm thinking of getting a PPC 6700, which is PDA/phone combo.
Granted, it's very convenient to have a PDA phone, but I would be
giving up some screen real estate. (I like using my PDA to
occasionally view movies while commuting)

My question is, should I keep my Dell Axim and pair it with a
compatible cell phone with Bluetooth (using the cell phone to dial out
to the Internet if need be)... OR sacrifice screen size for the
convenience of having just one device...the PPC 6700?