It will be a good gaming machine if you put some time into it. I have a xeon X5670 and have it overclocked to 4.2 on all cores paired with a gtx 660 and it runs like a dream as a secondary machine for when people come over. Essentially you'll just need to overclock it and find a good videocard for it. Expect productivity performance around that of a 6700k as once overclocked it scores similarly in cinebench. As for gaming I'd say once overclocked it would perform around stock 4670k performance.
That looks like a great list so far! Personally I trust EVGA powersupplys but that really comes down to brand loyalty but seasonic and corsair also do a great job. As far as the RAM goes while tighter timings and the such do give better performance the boost you are looking for in RYZEN comes down to frequency. This is because the reason that faster RAM helps RYZEN comes down to its influence on the infinity fabric as you said. The IF (infinity fabric) will run at half the speed of the RAM you buy. ( though technically it is running at its actual speed because of DDR or double data rate etc etc). This means that for the 3000mhz kit the IF will run at 1500mhz. I think that should be fine for your build unless you are willing to put a lot of time into ram overclocking as getting speeds above 2933mhz/3000mhz on ryzen can be difficult.
TLDR: Get either the EVGA, Corsair, or Seasonic and 3000mhz ram you have on there should be golden! Have a great build.
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