Nvidia will announce the release of the mid and low range gfx cards cery soon.
NVIDIA seems to already have a replacement for the ever-popular 7600GT and, yes, it is a DirectX 10 variant. The 8600GT will be first out of the gates and will sport cores running 540/1400MHz up to 580/1550MHz with a 256-bit memory interface.
The card looks like the normal 7600GT. There is no 6 pin aux power connector. There is two DVI-I and a SLI connector Slot on top.

The 8300GT and GS will sport half of the shader processors that the 8600GT will come equipped with, and will have cores running at 500/1200MHz GT version and 480/1000MHz GS version, the ultra version of the GT card will also be coming.

the pricing of these cards will be as follows depending upon the brand you choose
8600GTS is around $200-250
8600GT is around $150-180
8500GT is around $90

The above cards will be annouced by nvidia on April 17th, by May all the retail outlets will be having them.

The pricing seems to be really great for these cards, lets wait and watch how the Dx10 revolutions starts.