The last four I've put in have all been Foxcoon C51XEM2AAs, mainly because I'm building video edit stations and the onboard raid goes like it's jet-propelled. Downside: they're not amazingly cheap and the onboard audio is noisy. I got the first one effectively for free as part of a magazine review and realised how good they are. Unfortunately, with AMD seemingly unable to come up with a half-decent quad core processor, I will probably be moving to Intel next time. Shame. Never built an Intel box before.