From a gaming perspective, I think building a PC around Haswell-E is a waste of money. In general, inexpensive socket 2011 motherboards are almost as expensive as high end socket 1150 motherboards; I think the price range is about $240 - $400+. To me it is not worth going with Haswell-E unless you are going to get a six core CPU i7-4930k for around $580 - $600; the least expensive one. Additionally Haswell-E will need DDR4 RAM which will likely cost more than DDR3 RAM because it will not be as widely available as DDR3 RAM. I would say DDR4 would have at least a 50% premium over DDR3 RAM.
Going with Haswell-E means around a $900 - $1,000 investment. I'd rather build a gaming rig around an i5-4670k, then in 2015 / early 2016 upgrade the motherboard and RAM for a Skylake generation CPU. Lastly, pour gasoline on the i5-4670k, the mobo, and the DDR3 RAM and light it on fire. I will actually save money and more than likely get better gaming performance going this route than compare to going with Haswell-E.