I would spent less money on a motherboard and invest more into lots of fast storage. Xeon's in general are build for servers, which means they are somehow better for an "always on" system. Besides, they don't have a build in gpu like the i7 processors have.
I dont know, when youre planning on building a system that has to handle days of continouos rendering, I would go with a xeon + ecc ram solution. (ecc ram is build for servers as well)
But if youre not planning on doing highend renders which may take days or weeks, I would consider a combination of a Gigabyte GA-B250M-DS3H + Intel Core i7-7700 + 64GB DDR4 + gtx 1070 + a hell lot of pretty fast storage
I personaly have a 16 core 32 thread dual xeon system, 'cause I do lots of huge simulations and long sequence rendering.. it depends on what you are up to with houdini.