With your help freinds, i've decided to buy Sony mobile but now there is another problem. There are 4 models in which i am confused to which one to buy. Its Sony w800i, Sony w810i, sony w850i and Sony w900i. By its looks i am interesed in w900i, but i dont know its rate. if its too costly then i will go for some lower model. Can please you help me and tell me the difference in these 4 and the rate difference between them.