would Raka epoxy with the non blush hardener be a good choice? It seems with their non blush harder, you can apply subsequent coats before the first previous coat dries - saving the hassle of waiting for each layer to dry and wet sand?

That's true for all the epoxies I've used - (WEST, System 3, etc) The product specs will give re-coating times, usually. Even if you are using Raka, downloading some info from the WEST or System 3 websites could be useful if you haven't used epoxy before.

http://www.westsystem.com/ss/epoxy-chemistry/

http://www.westsystem.com/ss/epoxy-chemistry/
http://www.westsystem.com/ss/barrier-coating/
http://www.systemthree.com/reslibrary/literature/The_Epoxy_Book.pdf