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Unless you're doing really complex, in depth modelling, AutoCAD uses virtually no resources. When I was learning it at school, we had 1.5 or so GHz machines, and while it wasn't as fast as I would have liked, I never had any major problems with it. Unless you're doing it professionally, 8-10 hours a day, what you have would be more than enough for your uses.
And definitely don't go with the Corsair XMS. While it does make a difference, the difference between that and Corsair value RAM won't be noticable to the majorty of users. Get 1 GB of value RAM and save some cash.
As far as the graphics card goes, if you're used to a machine with 32 MB onboard video, the 6800 will be beyond your wildest dreams of performance. Unless you plan on gaming, it's plenty. I'd even wager you don't need that much, but it's really your call.
Also, doesn't that barebones system have onboard video? I'd forego the barebones system in favor of an inexpensive case/motherboard. But then again, I've never been a huge fan of barebones.
Also: include a good mouse and mousepad in the purchase. I know you have an "optical mouse," but a good mouse will make a lot of difference for you. It will make drafting much easier and more precise, and general use a lot more comfortable. I'm a fan of Logitech mice, but there are plenty of others to chose from.
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