Now the best time is to wait for W660 if really want gd quality mp3 player.
W660->everything have but dont have flash and autofocus only.
Don't go for the Red one because its way to femine for a guy to carry that.
W880 -> no radio , autofocus.
W850 ->bluetooth dont have A2DP ,autofocus
W810 ->Dont have 3G, cannot blame dont have A2DP because its consider old. But the rest really beats W880 and W850.
Stupid Stingy SE.

ehy the link u provided isn't working. So far most of the site i check display the bluetooth as 2.0 only without A2DP. Besides , i think theres i countless of girls and guys using w850 already -.-.

Going for very low budget prices would only restrict to AP models.
All phone is overall and have their own unique features.
All depends on whether u want good camera/music experiences(u cant aim for both). For good walkman phone i think so far SE is still the best. Nokia is overall only. Cant compare Nokia with SE because Sony is famous for their sound system.