MSI K8N Neo4 Platinum
t-break - MSI K8N Neo4 Platinum. Good review of a nForce4 board. This one is not SLI but it has about the same performance as the others. Doesn't seem to be much difference in performance between different nVidia nForce4 boards, so main difference is SLI to put two graphics cards in.
The "SLI":http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=241159 version is due December 28 at Zipzoomfly for $209. This is about a $100 premium to the nForce3 250Gb boards and it performs the same. The $100 buys you the dual card option so it is kind of a bad deal if you are never going to put two cards in.
The value deal right now is to get a nForce3 chipset with a AGP graphics card.