In early-mid 2013, I was preparing to set up my own workstation and so I did a survey of peers, using publicly available information (blog posts, etc.) as well as personal emails. I've posted a summary of my findings in a Google Spreadsheet in case it is useful, despite being over a year old. Since I didn't get permission from everyone to share their info publicly at the time I gathered it, I've removed all identifiers.
In my own case, I knew we wanted to run FTK and when I priced out a customized desktop machine that would do that well, I found that it was close enough to the cost of a FRED to be not worth the additional work that the customization would take. Of course, YMMV.