i have done it. i have designed a system for gaming close to what you have but better and cheaper. i took your designs above and modified it slightly and gave you a better and faster processor for less money and a all around better system for gaming. it took me about an hour and half so dont be too critical on me i did work hard on this but this is a killer gaming system for under a thousand dollars that has twice as much processor, twice as much ram, and twice the video card for under a grand. if you are interested i will help you make this dream system a reality. i have priced everything at microcenter. i have one here in cincinnati and they base there prices to beat (majority of the time) to beat newegg.com i have dealt with microcenter for years and they are great. so here you go here is the system you have been waiting for.
If your looking to buy I might hold off until ATI and nVidia launch their newer equipment in Feburary.
Not sure if you did this, but if you get Vista 64, get the system builder. Its much cheaper, but it doesnt come with support. But if anything goes wrong, its not going to be the actual software, so back everything up and re-install the OS. http://www.newegg.com/Product/Product.aspx?Item=N82E16832116215
https://secure.newegg.com/NewVersion/Wishlist/PublicWishDetail.asp?WishListNumber=6762131&WishListTitle=MDK+%2D+%241%2C591+Intel+Ati+GamerOk here is a link to the wish list i specifically designed around what you wanted.
well ponce i am glad you liked in general what i have picked out. the only thing i was going to say is about the ram. corsair is a good brand i agree but OCZ is the brand that i have always used which is the one i picked out for you. with corsair your only buying a name not quality. OCZ is compaired to corsair many of times on forums and you will see that for your money i would definitely go with OCZ over corsair. i know its the only kind of ram i will use in systems. its well built easily cooled and runs great and its not harsh on the pocket. you see you can get double the ram for cheaper than corsair. but ifyou dont believe me do a search comparing corsair to OCZ and you will see.