Thanks everyone,after much of discussions and 99% sure of buying a nokia lumia800, now i have samsung galaxy s 3 with me.
It's just like a cadaver to me when i first joined my mbbs,gradually the cadaver was the one who taught me a lot and so i think this phone will do the same.
One techguru friend of mine had gone for buying and shifted first from lumia to iphone 4s and then this galaxy s 3.it was (37100+VAT+FLIPCOVER)~40000
and i had nothing much to do except signing the amount.I tried to understand the whole conversations but all of of it was a bouncer for me,
and in the end he said take it it's got all you need and worth the money.He had a good talk with the shop owner for about 2 hrs regarding all the phones and finally told that this is better than nokialumia and iphone 4s.
Well only time will tell that is this phone worth the whole lot of money or not.
BUT one thing is for sure my budget is shattered now,i hope not choosing a nokia will not give me a heartattack in coming days.