well might just be the Best gaming pc configuration in 2013 till now within 1lac
I think we can up the anti these days from the old 5400rpm speed drives. Get a 250 GB SSD or even better, a PCI SSD and 16GB of the fastest RAM possible. Personally I would go dual ATI mid high range graphics.
The problem is, the "best computer" without any context translates into "the most expensive computer". If you want any real advice then you need to specify a budget, or this thread will just devolve into people recommending increasingly ridiculous configs.