You may want to look at a Intel NUC. I'm using a Intel NUC6i7KYK for my Plex home media server and am very happy with it.
This model uses a i7-6770HQ processor. I've maxed it out at 32GB of ram, and have it setup as RAID 1 with two 1TB M.2 SSDs.
If you go that route, you buy the NUC, and add in the OS, ram, and HDs. It's about the size of a paperback book and is fairly quiet.
If you don't need that much power Intel does make cheaper/less powerful NUCs.
Last edited by wr_schwab; Aug 2, 2016 at 2:28 pm
Reason: Grammer