You dropped the case?
I have a vertex 2e and I have no complains. Does what its suppose to do (speed up windows and apps). I am running at 2/3 capacity wiht a couple of games and all my apps.
For the motherboard, seems a bit too fancy for my liking. I like the looks, but I'm not sure what it does to the temperature of the motherboard components underneath.
MSI GD65 Gigabyte UD4 or ASRock Extreme 6.
I like the ASRock but it's expensive. Looks good too.
I would go for the MSI, has all it needs and it's cheaper. But if you want something in the league of the Sabertooth, that would be Extreme 6.
A water cooler would be no problems, but I'd be a bit more cautious with a big air cooler. Those VRM heatinks are HUGE.