low end = around 300
mid = around 400-450
high end = 500 or more
I have a feeling dx10 cards will be extremely expensive when they first come out.
I'm gonna agree with desidude006 here. DX-10 will probably fetch a premium, due to peoples wanting it for VISTA. Many of the previous GPU series didn't have an OS depending on them for best effects. Most GPU generations featured subtle changes for gaming(i.e. SM3.0,HDR, etc),didn't affect OS, but DX-10 is as much for gaming, as OS.