I am currently looking to purchase a PDA. While it will be primarily used for business, I would like the functionality of a universal remote. Any expert advice would be appreciated.

I am currently considering the:
HP 4705
HP 2750
Dell X50v

I had thought about the Dell X30 and HP 3715 as well, but wanted more horsepower.
Any information regarding past use of any of these 3 devices as a remote would be very helpful. Also, if anyone has any knowledge of compatible programs with these devices, please advise. Thanks.