I have got my Gigabyte K8NS a week ago. It is about US$100, which is the exact board described here:
http://www.hexus.net/content/reviews/review.php?dXJsX3Jldmlld19JRD03NTE
It is very stable, having passed all stress tests and benchmarks I tried memt86, prime95, pifast... I haven't tried OC...