Just hit the trigger myself!I ordered a Mac Mini 2018. I debated between the iMac 2017 and the Mac Mini and I just decided I liked the extra flexibility of the Mac Mini. When it gets retired from my desktop, it will be easier to find a place where I can put in my entertainment center, bedroom setup, etc. I have a 2010 Mini that this is replacing in my office, but I am going to keep the 2011 iMac around until at least Apple comes out with their pro monitors next year. I am hoping this will be able to use the iMac monitor with target display (my 2016 MBP will - I route it through a thunderbolt 1 dock), but I also have a 4k monitor up on an Ergotron Mount I can use as a primary or secondary display.
Pretty excited to see how it performs.