TRAI has given thumbs up for 3G and testing is already going on in Delhi, Mumbai, Chandigarh, Chennai etc.
Go 4 N70. It's future proof and India will see 3G in The 1st or 2nd quarter of 2007. If u can change handset later then buy N72 now. But i still recomend N70.
Man, 3G is really great...