I don't want to scare you off too badly, but if you're uncertain about things in a build then you may want to stay away from doing a server/workstation build. For one thing, dual E5 2670s are not going to be any better than even a quad core i7 for gaming any time in the near future. There is a huge clock speed difference. And for a light workload, it's entirely possible that there may not be a linear speedup for 32 threads. In many cases, a smaller number of fast threads is more productive than a larger number of slow threads.
If you decide to go ahead, here are some things that you might run into:
1) First generation E5 2670s aren't terribly expensive right now, but the motherboards for them are getting to be harder to find. They're often out of stock. Newer E5 2670s are extremely expensive.
2) E5 2670 is not LGA1366, it's LGA2011. You NEED to pay attention to the version number after the 2670 (v2, v3, etc), because it's one of the more important things. No version number or v2 is LGA2011, version number v3 or the upcoming v4 is LGA2011-3.
3) There are TWO incompatible cooler setups for LGA2011. A narrow and a square setup. You have to buy the right one for your board.
4) The BIOS version HAS to support your version number. You need to actually check that before buying your motherboard. If it's impossible to find out, buy a different board.
5) Server mobos are terribly picky about RAM. You'll need to verify that either the mobo was tested against the RAM or the RAM was tested against the mobo. Kingston is relatively decent about that testing. If you don't there is a decent chance the machine won't boot.
6) To drive this home a bit more, LGA2011 have sets of 2 and sets of 4 in their memory banks. In most desktop mobos, as long as you populate any pair you're golden. Often times for servers you HAVE to populate pairs in a specific order or the machine won't post. And this isn't always documented in the manual. Making sure you get effective quad channel memory performance can be even more annoying unless you buy quad channel kits of RAM because oftentimes RAM manufacturers use different memory chip suppliers even for the same model.
7) Your PSU should be fine if it's the one I think it is. But you may want to make sure it has 2 8 pin CPU connectors. Not all PSUs have that.
8) Many server mobos do NOT have PCIE x16 slots.
9) Most server mobos do not have sound cards. You'd probably need to buy one separately. You'd have to make sure there is a free, compatible slot for that. Server hardware tends to run behind desktop hardware in a lot of ways, so current boards may not have some things that you would expect, like USB 3 ports. That may also require an add on card.
10) Your case appears to be large enough, but many don't support all possible SSI EEB hole configurations. That may require some manual modding on your part.
11) There are a TON of proprietary things to worry about. For example, Supermicro mobos require buying an adaptor to the front pin headers unless you use a Supermicro chassis, and sometimes even that has issues.
12) Server mobos are crowded. Pay attention to things like heat sink clearance issues. Many standard cooling options simply don't fit because they bump into something or other on the board.
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