They are all stable boards. Based on the reviews and benchmarks I've seen, both of the Gigabyte boards outperform the Asus, especially the Quad Royal. My understanding is that boards available now with the 975X chipset are not, and will not be with a BIOS update, Conroe compatible. So if you buy now, I think you're hosed for Conroe support. For what it's worth, the Foxconn NF4SLI7AA-8KRS2 benchmarks pretty well, and gets good marks for stability, as well.