well as others mentioned, a winmo phone in that range wont have a really good camera, or the music player, but the no of apps u can find for the winmo phones is limitless, i ve been using the HTC Touch since 2 years, currently upgraded to Windows Mobile 6.1 with Onyx Ult 4.6 and the customization options are endless, but then again it totally depends on how much time u wanna sped on the phone tewking it, if u want a no nonsense phone, then Nokias are the best, but if ur like me, continually experimenting with different apps, skins, and loads of other stuff i guess winMo are the best, m looking forward to replacing my age old touh with a Touch Diamond 2 very soon.
neway hope to have somewhat answered ur question.