Can someone suggest me a Graphics Card?

[hulkman]

Hi,
I want to buy new graphics card, I love playing games on my pc , so i want a great graphics card which can run all games including latest and upcoming.
I am poor at Hardware. Please make sure its below 200$ or Rs. 10,000.

Here is my Configuration:
Mother Board: Intel Corporation DH55TC AAE70932-302
Processor: 3.07 gigahertz Intel Core i3 540
My current Card: NVIDIA GeForce 8400GS (This sux).

Can anyone explain me whats hyper-threading and cache size regarding processor? What does it deal with?

-Thanks