I've got a new phone, but I thought you might be interested in how a chose my old phone:
Let's start with battery life - 10 days on standby, not bad at all.
User interface - apart from one quirk (the "go away" button for a reminder and the alarm isn't the same) it's pretty much perfect. The thing you most want to do is on the top left hand button. So once I've composed a text I can send it to my wife with just 5 clicks on that button (so long as she's first in my address book).
Security - it has no internet access, so it you can't get at my email or into our corporate network. It can't get viruses. As an IT director this is important, so that's a great strength. One flaw - memory isn't encrypted.
Price - This has to be the one thing that clinched it for me - my mum swapped it for my old phone so it didn't cost me anything.