Very open ended question to answer. I’m in the same boat trying to choose the “best” phone for me.
Standard phones (3MP camera): Sony Ericsson K800i or Samsung D900
Smart phone (3MP camera): Nokia N73
MP3 phone (2MP camera): Sony Ericsson W850i (not sure how this compares to the W810i?)
Smart phone, touch screen (no camera): Sony Ericsson W950i (?)
Nokia’s line-up currently seems weak. I’d quite happily buy my current 6230i with an upgraded screen and 3MP camera.
http://www.mobile-phones-uk.org.uk/index.htm is quite informative. I’d welcome some other comprehensive mobile phone review websites.