Be careful with benchmarks. They aren't absolutes. You should use them as a general idea of a performance level. So if Product-X beats Product-Y by 10 units, that doesn't mean Product-X is the absolute best choice. Here's a quick comparison between the two CPUs. I say quick because there are many more benchmarks that support both CPUs.
http://cpuboss.com/cpus/Intel-Core-i5-4670K-vs-AMD-FX-8350
Typically, Intel leads the gaming area. But AMD isn't far behind and depending on the game and budget, the AMD CPU can be a better choice. Considering your budget, I'd go with Intel.
How much space have you used on the 1 TB drive? Personally, I'd say forget the 2TB and get the SSD. There's nothing like a crisp quick boot and fast game loads. I'll never build another computer without one. I just built a PC for my grandparents from old parts I had. I bought a brand new SSD just for their primary drive.
http://pcpartpicker.com/part/samsung-internal-hard-drive-mz7te120bw
As for the RAM speed, if you don't want to overclock the RAM for benchmarking or just to learn how to OC RAM, there's no reason to buy it. You will not gain any performance for gaming from OC'd RAM. The primary practice is to simply OC the CPU and not the RAM.
The Extreme4 is a good motherboard for OC. It has a 8+2 power phase design for OC. Power phases are important when overclocking because typically, the more phases the higher, cooler and more stable OC can be achieved. But you don't have to buy a 16 phase board, those are overkill.
I like Coolbeans build but the PSU. The CX series has a bad rep around here because of the cheap capacitors in them. If you stick with Corsair, I suggest the TX or HX series PSU. If too pricey, the XFX PSU in the first build is a good choice.