Radeon X1900 prices have dropped pretty substantially in the last week (no doubt partly due to the impending release of the X1950), so I don't suppose they'll fall much further.
Ahh, hadnt really looked in a good while. If they're low enough I might just have to search for some extra money.
VR-Zone has some numbers posted, take them as they are I guess. System is a bit more powerful than the one used in the Hardwarezone preview, VR-Zone uses a Conroe based system.
http://www.vr-zone.com/?i=3885