Many people are aware of Nvidia’s recent launch of the low and mid range DirectX 10 cards. People are questioning if the 8600 series will have enough punch to handle next-gen released games.
“NVIDIA® GeForce® 8600 graphics processors feature the award-winning GeForce 8 Series architecture with unparalleled levels of graphics realism and performance for Microsoft® DirectX® 9 and DirectX 10 games for the pricepoint.”

If you're one who isn't concerned with gaming, it would still be wise to consider the cheaper 8500 cards, as they will perform exceptionally well for business applications. There is little heat output and Gigabyte has released a fanless heat sink version that will please those who are concerned about noise. The 8500 cards still come with dual DVI outputs and a few offer HDTV as well.
Some are a bit hesitant to fork over big bucks towards a higher end 8800 GTS. It would be wise to take a look at the new 8600 series that Nvidia has to offer. With it you’ll get DX10 capabilities for the future and many card retailers are releasing HDTV adapters. This will allow the consumer to hook up to their chosen HDTV and use it as a monitor. Either way you could still do the same thing through a DVI cable if your HDTV supports it. Based on the charts the 8600 still easily handles current-gen games. Remember that ATI is planning a release of their new cards supporting DX10, so it would be wise to hold off if you’re still unsure of a purchase.
Source - AnandTech