Why exactly do u need USB charging? Are u always far away from a wall socket? If u are near a wall socket, u can plug in ur charger and also ur connectivity cable simultaneously so that ur ph can be charged while u surf or download.
Otherwise why dont u buy a Motorola or Sony Ericsson ph. I remember that even the SE K750i could be charged by the connectivity cable by installing a driver. So all new SE phones should also support this feature. All new Motorola phones also support USB charging.
The Nokia CA-100 charger is overpriced. Anyway, are u sure if it could be shipped to India or not? ?