Hard drive prices are finally starting to go down. 1TB hard drive prices have dropped $30 in the last two months. It will take longer for the prices to get down to the pre-flood levels but they will get there. The rest of the changes were price fluctuations and replacement of discontinued parts with newer, faster, better versions.
On the video card front the 2 GPU cards are gone from stores. Single chip Nvidia GTX580's and ATI (AMD) Radeon HD 7970's are the current high end. I imagine both manufacturers are cooking up new 2 GPU cards.
You can find the main Parts Lists page here.