In my 10 or so years of building and my 2 years of professional tech work I haven't found anyhting to be the perfect solution. I normally prefer ASUS, but I've had those fail on me too. Vertain models are of course better then others within a brand.
Gigabye (lots of nice features for a low price. You get what you pay for).
ECS, PCchips, and the "ones you've never heard of" have always been rather unreliable too.
My point is brand is very important, so pick a good one, but byond that make sure the specific version of the model you want is good. ASUS might be great and my favourite blah blah blah, but the P5GDC was a nightmare. I had several of those fail on me at work.
I always look at ASUS first. They can be a little more expensive, but bang for the buck balances with them quite well. Of course there's DFI for those with deeper pockets than mine, but nevertheless a good choice. Tyan makes good dual socket boards, but I don't mess witht hem for anything else. MSI and Abit I kind of hold about equally. MSI is known for DOA, but if you get a working one they tend to be pretty reliable, and they have good feature sets. (And they look friggin sweet!). Abit is another decent choice, but they tend to be on the cheaper side of things and take a few shortcuts.
Bottom line, research by model more than by brand. I bought an A8N5X; why? Because it was a brand I'm most comfortable with, that had the features I wanted, within my price range, and it got good reviews from most sources. It always a bit of a risk, but we do what we can to minimize that.
Constant Vigilance,