Down to one...

I really looked hard at the NEC 525, trying to find a reason to like it. The only one I found was that it's $100 less than the Motorola V600. Other than that the closer I looked the more I found not to like.

As for the Sony Ericsson T616, being able to get and keep a signal is the primary reason for having a cellphone, and I've heard that there are reception problems with it. Howard Chui reports "poor RF performance".

The Motorola V600 seems to be very close to the size and weight of my current phone, the Motorola V60, which the best phone I've ever owned. It's as small as a cell phone can get, but because of the clamshell design it is totally usable.