Initially I liked the ASRock Extreme 4, but after reading several reviews it seems that ASRock boards are more prone to DOA/bent pins than their formadible father-brand, Asus. The Asus P8Z66-V LK and the P8Z77-V PRO are my other considerations. Are there any who have had experience with any or all of them?? My main concern is reliability. I will be overclocking and pushing my system slightly, but I dont want to risk the time and money of a faulty board. Here are links for both.
If it's in your budget to get then I would go with the V-Pro, yes it's more expensive but it's loaded with features and Asus boards are known for being overclocking friendly. I have not had experience with that specific model but have been using Asus boards for years and have accasoinaly tried others but have always come back to Asus.
There will always be the risk of a defective board and it's really something that you can't predict or get away from, if your going to get one then your going to get one. Nobody is immune from getting a defective component, what's important is how it's handled when you do.