There is ZERO, repeat ZERO reason to purchase a Xeon for a gaming rig. I will shoot down this recommendation every single time so fair warning. You can't overclock these CPUs and the coolers are a wasted purchase on them. You do not benefit, you will benefit more from purchasing an unlocked CPU and overclocking it.
I would disagree since I've been using one for nine months and love it. Still, there's nothing wrong with ASUS, Gigabyte, or even MSI at the same price point (will point out that ASUS boards in this range have the same, in some cases fewer, eggs...).
Do you live near a Microcenter? Can get an in-store combo on 3570k and z77 mobos.
Why you think that 3570 k is better than xeon 1230V2? Extreme4 can overclock it 4.2GHz or so.
And gigabyte overclocks xeon to 4.0GHz. Which is faster
They're both good boards, the Extreme 4 is slightly cheaper and has the same features. I would rather pour the remaining money into getting the best GPUs on the market like the Gigabyte Windforce that I linked to, that's where it counts on a gaming rig, everything else comes second. Asrock started as a subsidiary of Asus and in the last couple of years they've got really high remarks from a number of sites for their boards.
I wouldn't purchase a Corsair H100, if you're going to use liquid cooling I recommend doing a real, full custom loop or just using a Noctua D14.
AMD was able to overclock the Trinity A10-5800K to 8.4GHz but that was using an oil-based cooling solution. I'm pretty sure you couldn't achieve speeds that high without something similar.
The Xeon E3 isn't meant for extreme gaming, it's meant for server applications and things that need a high CPU work load like CAD / rendering, things of that nature. Gaming doesn't really need a high CPU workload - there's very few games that take advantage of hyper threading out there and that's not really the place to spend money.