Which phone do I buy?

[lavondys]

Also, does the W610i support mp3 ringtones?

Yes it does support MP3'S.

see here:

http://www.letsgomobile.org/en/cellu...ericssonw610i/

Id go for the 850i:

http://www.letsgomobile.org/en/cellu...ericssonk850i/

Personal preference but id go for it just for it 5mp camera as my wife would certainly appreciate it as she's a professional photographer and just happens to misplace her camera when i get a new phone!!!!!!

Lav