The Sprint Touch or Mogul could handle these things, though the screens aren't particularly large. PDA phones generally have smaller displays than their non-phone counterparts because folks want phones to be smaller and more pocketable.
You might also want to consider a VGA Pocket PC which is much higher resolution and has a larger display. There's also the Palm T|X with a higher resolution (compared to PDA phones) display.
-------------------- Lisa Gade Editor in Chief, MobileTechReview