For me I had a Samsung m100 which was amazing because it was one of the first phones to have an mp3 player built in.
then a samsung T100 because it had a an amazing colour screen and had real music and speech polyphonic ringtones.
Nokia E71, a full qwerty keyboard
Nokia 6310 had about 10 days stand by, the menu were so fast you could just remember the keypresses without having to look at the screen
The one I got now the is google G1 I have had for about 7 months which is about 6 months more than i normally own a phone for