I have learned with H1Z1, that it behaves much better online with a hard line internet connection.

Also, I have found This 700w Power Supply far superior and roughly the same price as the 500w you choose.

Also, if you currently have a PC, you could in theory use the optical drive from it in your new build, save ya around $20. Optical Drives are not as necessary as they once were.

With that $20 savings you could get more ram, (I know you said you might upgrade down the road) but you can get something very value such as This 16gb Ram set for cheaper than the one on your list.

Although my personal opinion and recommendation would be This 16gb Ram Set.

Good Luck on your 1st Build!