I would say go for the C860! i just had it for a week and I am really impressed by it.
Totally agree.
C860 is FAST and great (once you set everything up the way you want).
Not knoing what you want to do makes it harder to say whether it will fit the bill for you.
I had a 5500. but even without 4x the resolution, I would get the c860 just for the keyboard !
400Mhz CPU (easily overclockable) and 200Mhz bus makes this baby scream.
Only slow app I ran accross was MAME....and that is most likely do to lack of Z optimizations.
Only two wishes for Z (that I can live without) are SDIO (in progress) and suspend On CLose option (which may be in the next release of CackpQT).
Movies Rock, Music, PIM, NES EMU, SNES EMU, Native games, Java, Linux , dual expnsion, clamshell, full keyboard, Microdrive compatible (I Love having 4GB and then SD 1 GB !!) WIFI, Email , Web, OpieReader (Z4CK !!!) , Swivel capability (not much use for that for me though), backward compatible with tons of 5500 stuff, and of course, the best part of all ZUG....The only down side to the Z that I can see is that it was made by Sharp....a company, that in my opinion has don everything to alienate the very people trying to make this a success (users and developers).