it depends on your usage.....whether you preer windows mobile or PALM OS......big difference there....so choose according to your needs

most of palm os pda still can't multitask like pocket pc.....

palm can do very minimal multitasking.....only some palm os pda can only play mp3 at the background at most...while others only allow one application at one time

for pocket pc pda....you can multi task like you use your computer.....open ms word/mp3/internet explorer/games/...so on......

try to go with ppc with higher cpu speed...try to avoid anything within the range of 200MHz