I know you already have a card coming, but offer this up to anybody who is still reading. I used to sing ATI's praises, especially for their FireGL line, which is now still their best AGP stuff but has been "better" by the latest ATIxpress stuff.
Since SW 2005, when using SW itself, the FireGL card is still a very nice bang for th ebuck deal. However, when using DWGEditor, there are graphic annomolies that are aggravating. I have tried it on a different box with a different card, and those annomolies disappear, but that card isn't as good in SW.
So, you take the good with the bad in some cases.
Mr. Pickles