Not sure why it was locked, but I can answer your question without violating the NDA. (dont ask people if they are in beta, at least not in public!)
Your system will have issues yes. The changes you suggested sound along the right lines, but instead of a 6800, wait until closer to VG release, and buy a 7800 or 7900 (possibly two), as these will have reduced in price quite a bit by then. 2GB RAM would be a minimum in my book, RAM is so cheap nowadays anyway.
Whatever you decide to do, dont do it now, unless you want to play Oblivion (huge video RAM hog). Start saving now and maybe you can afford one of the big boy video cards by then
