Don't come to a false assumption because of the link you posted, getting to 5.0ghz and showing a CPU-Z application open, does not mean it could even be Validated, much less be able to run Prime95 for any time at all, so if you're under the assumption what you read in overclock3d.nets review is a 24/7 possibility of running 5.0ghz on air cooling, you may and possibly will be seriously disappointed.
5.5ghz on air cooling, forget it!
Leaps-from-Shadows has given you some good advice, and I'll add the ASRock P67 Extreme4 to the motherboard list, as I've had great results with it.