Just as an update to my last post, I've checked several benchmarks of the i7-4930k vs many of Intel's current gen e5-2XXX v2 series that are 6 core, 12 threads (like the Xeon E5-2620 v2), and the i7 blows it away. It performs almost twice as well in many benchmarks and they have about the same cost (~$550). I would definitely consider the i7-4930k setup I listed as a viable option.
The CPUs you listed are older, are at a slower clock speed, and are based on slower architecture (32nm vs 22nm) compared to the e5 I listed.
Just some other thoughts,
A) If you live near a MicroCenter, you can get the CPU for $530 and $50 off any motherboard. A good option is the Asus SABERTOOTH X79 or the Gigabyte GA-X79-UP4.
B) Get RAM from Newegg.com and keep your eyes peeled for low prices. This, (http://www.newegg.com/Product/Product.aspx?Item=N82E16820211814) is awesome memory and usually dips down to $126.99 very often. Sometimes, you can combine it with the '10% off Desktop memory' that Newegg sends out to people on their mailing list once or twice a month. Last week, I picked up 32GB for ~$220 after shipping and no tax.
C) A good, cheap option for PSU is the Corsair CX 500W, which can be found for $29.99 after $20 MIR at many places much of the time. Finally, I know you said 1TB is fine, but I keep seeing 3TB HDDs popping up all over the place for under $100. Right now, Fry's has a 3TB 5400rpm Western Digital HDD for $90 until March 22nd (http://www.frys.com/product/7725758)
D) There are many good Cooler Master, Corsair, etc. PC cases that frequently dip to $30-$40 after mail in rebate.
You could potentially make this machine happen for less than $1000 if you are patient and use all options available.