well for surfing net 6630 is the bst....but if u want fm u can go for 3230 which costs around 10.500 now .another good choice would be 6681 which costs around 13,500.
But if u can increase ur budget or wait another 2 month then def go for n70..coz its now king of the market. i hav it along with 3230 nd both are pretty good.
My internet exp with airtel gprs has been extremely good so far