Most of the top-tier mainboard manufacturers have had the occasional "dud" board once in a while, but you need to look at their success rate overall. Generally, I wouldn't have any particular issue with anything from Gigabyte, Asus, Abit, and a few others.
The thing to do is do a google search and newegg search for the specific board you want, and start checking out the overclocking forums and newegg user comments and ratings. In just a few minutes you can get a very good sense of whatever odd problems a particular board may have (and trust me - EVERY board has at least one weird little problem. No board is perfect.) One of the nuances of my gaming PC's mainboad is that the voltages are a little low compared to their BIOS settings when overclocking, and this is easily compensated by going a little higher in the BIOS then you think you should, or somehthing called the "pencil trace trick."
-Llama