http://www.pcgamer.com/best-mechanic...es-for-gaming/
since most popular mechanical keyboards have roughly the same keys inside them brand isn't really that important. Choose what kind of keys you want instead. I would recommend just buying a keyboard that doesn't have a lot of extra features, lights and macro keys because they will in most cases just add a lot to the price and you will most likely never use them anyways. There are some mechanical keyboards that doesn't have a numpad, like razer tournament edition which is nice.
I personally use CMstorm TriggerZ, I used Razer Blackwidow before, but the blue keys were just so amazingly loud. I can vouch for any of the DAS, Razer and CMstorm keyboards.