I think w810i is better wor when comapring to w900i
Of course, if u want to have 3G, then w810i must be out of ur choice la.
However, it seems that u r choosing " W " series.
y dun u choose w850i lei? It is song tracking function wor and also 3G lei!!
If 3G is not a necessary to u, then no need to think la, w810i la