Hi,
Good choice - it is the one I would have gone for.
If you change your computer you can always take this out and move it to the new machine.
You won't be disappointed with it.
If you ordered from Amazon it should arrive within a week.
see here
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-2.html
You may need to upgrade the Power Supply Unit to run the card
I am sorry - I should have pointed this out earlier.
Do you know what Wattage the PSU is ?
If not - there should be a sticker on the unit itself.
I think 400Watts is required.