About a two week process going from the initial researching to part picking to waiting for shipping to build complete. $650 spent with everything including monitor and OS (no optical drive because it's not needed).
The only tricky part was when I hooked up the external build and it wasn't POSTing. I thought it was the PSU but the paperclip test turned it on. I rechecked all the connections and that was it.
PCPartPicker definitely helped but I found some deals on websites (combo deals mainly) that I couldn't find on here.