Are PDA's a thing of the past? I need a rec for a handheld client information organizer.?

My Sony Clie is dying on me, so I need to replace it with something that will hold all my client information (addresses, phone numbers, emails, fax numbers, etc.) that I can carry around with me like a PDA. I've only found one or two online. I need a better selection than that. I don't like using my phone for that, so I don't want it to have phone capabilities.