I have had the ASUS for two months now, and it has been trouble free and rock solid. I would highly recommend it. It is definately the most mature and likely the most stable choice. The only unresolved issue with this board at this point is the inability to run ram over 250mhz(DDR500) 1T, which if your not a hardcore overclocker is not an issue. And it is well documented that with the A64 platform memory speeds only slightly increases performance. I,m running my 3200+ at 2.6ghz with ram at DDR480. And its currently selling for less than MSRP
The reason there are so many problem posts here for the Asus is as of now there have been many more of the Asus boards sold than all the other NF4 boards put together. And only the people with problems post on forums like these. And the early postings from the other NF4 boards are showing the same exact issues as the early adopters of the Asus. If you get a guality power supply with plenty of amps on the 12v you will have no problems with the Asus board.
For hardcore overclockers who must squeeze every ounce of performance out of their rigs, the DFI or MSI boards will have a slight edge over Asus as long as its limited to 250 1T. Although these boards look very promising for overclockers they are just now hitting the market and performance and stability is still to be seen.
Bottom line is if you must be on the bleeding edge of overclocking get the DFI or MSI, but if you want dependability, features, support and the the best SLI layout you should get the Asus. And at around $170 its also the best priced option IMO
The Abit AN8 Fatal1ty is an interesting newcomer for overclockers also