Please suggest me a laptop or customization site as per the configuration option.

I want a laptop of configuration below:

Processor : Intel 3rd generation quad core i7 processor or AMD equivalent.

RAM: 8GB DDR3 will be good.

graphics card : NVIDIA or ATI Radeon 2gb gddr5/ddr3 (gddr5 will be better)

hard disk : 500GB to 1TB SATA HDD.

battery back up: 9 CELL.(long hour operation)

OS: DOS / windows xp/ windows 7 home premium. (DOS will be better, as anyway I will install some linux version like fedora or opensuse or ubuntu for my work).

Preferable site and store located in India

preferable price range: 60000 to 80000 INR.

THANKS IN ADVANCE

Dell Alienware ? Try this as well > Samsung Ultrabook NP900X3A-A04IN There are plenty available in that price range.

Although it is none of my business but just out of interest what are you going to use this for? You could save a lot of money by settling for a notebook with lesser specs. Laptops are not really meant for gaming or other resource hungry applications. I am guessing that this is your first or may be second laptop ever.
You could get a laptop and a desktop for that money both with reasonable specs.

There is Lenovo x230 as well.