Windows 7; new graphics card?

[ANDEWEGET]

Im thinking of getting Windows 7(I think Ill go with Home Premium). Of course i want to take advantage of DirectX 11. As much as possible. That involves(AFAIK) getting a new graphics card which is able to take full advantage of DX 11. Tips? ATI or nVidia(i prefer ATI)? Is it possible to use my current card(ATI Radeon HD 4870) simultaneously with the new one? Is a fully DX 11 compatible card worth its money?
I googled most of those questions but wanted to have answers out of experience if possible

[501st_commander]

Im thinking of getting Windows 7(I think Ill go with Home Premium).
GOOD IDEA! lol
Of course i want to take advantage of DirectX 11. As much as possible.
its nice
That involves(AFAIK) getting a new graphics card which is able to take full advantage of DX 11.
yes
Tips?
look at the following link, it gives DX11 support info in ATI cards. http://products.amd.com/en-us/GraphicCa ... &f15=&f16=&

ATI or nVidia(i prefer ATI)?
nvidia is much better. AMD is blah.. imo.. intel and nvidia ftw
Is it possible to use my current card(ATI Radeon HD 4870) simultaneously with the new one?
possibly
Is a fully DX 11 compatible card worth its money?
yes

[ANDEWEGET]

1. Thanks. Ill try to get the newest ATI card for 650€... Thatll rip a big hole in my pocket.
2. Nvidia might be better in terms of performance and has PhysX, but i experienced so many problems(especially with older games) with nvidia cards compared to ATI.