A: Choose someone with EXPERIENCE
Concrete is one of the most difficult countertops to make and install successfully. One thing you should know; it will crack, it is just a matter of when. Concrete is a "rustic" surface, that has many imperfections, which is what makes it full of character and beauty.
You should research Fu Tung Cheng Concrete at http://www.concreteexchange.com/ He is the master of concrete surfaces (mainly countertops), he gives training courses, and has a contractor finder on his website. I worked with a gentleman here in Sacramento, CA who trained with him, and he was amazing.
There is also a company called Squak Mountain who make prefabricated concrete counters. You can look for a granite fabricator who might fabricate this material.
Good Luck with your tops! Concrete is one of my favorite surfaces!
Also remember that concrete tops are not cheap, so be prepared to spend more than the cost of granite. Anyone with good training will charge you what they are worth. There is much preparation and manpower needed for concrete tops, so don't look for the lowest price if you really want quality.
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