Dell C1100 are not widely spread in EMEA where I live. You can have a look of my Homelab here (http://www.vbrain.info/?page_id=230). At the moment I'm searching for a new NAS and new servers but the should be WAF certified (Wife Acceptance Factor).
I use the x3650M2 mainly for preparing for my VCAP exams with nested ESXi etc. but this servers is really power consuming.
For my new lab I'm looking for some power optimized servers or hardware. Maybe some SuperMicro server boards and Intel Haswell XEONs but it's also a budget constraint.
There are also pretty cool C6100 server on ebay but I think this one are also very power consuming.