I wouldn't say that Palm OS is old technology, it works wonderfully I have never had a customer come in with a problem on the PALM versions (I have been doing this for 4 years). The Windows Mobile Treo's however are horrible, that software is sooo glitchy, I hate any Win Mo phone, Treo's aren't the only ones that have problems. I currently carry a blackberry and I love it. I would go with either a Palm OS Treo or blackberry.
I have owned the following as personal and business devices. In short, the Treo remains one of my best devices. The Pearl had the potential to be a great device for me however the memory leak issue is really bringing down ,y rating however it can do almost anything.
Palm Treo 650 - personal phone on Verizon Wirseless, probably one of the better devices I have owned after Palm/VZW issued firmware updates. Motorola Q - personal phone on Verizon. Decent however it really was a disappointment. iPhone - personal phone on AT&T - awesome device with some flaws Blackberry Pearl 8130 - personal phone on Verizon.
Business Phones w/ Enterprise Security: Blackberry 7100 on TMobile - aweful Blackberry 8700 on Cingular - not bad Blackberry Cu... (continues)