Not sure about 'best" but I have built like 4 systems since my 2500K (which is still purring along @4.5Ghz), last one being last year for my 12 yr old, a 6600K with MSI board. I just stick to the $130ish boards from Asus, Asrock, Gigabyte, or MSI. None of those have ever really failed me. You...