Great looking machines here! For my part I have a ZX Spectrum +3 in my collection, I find that its a little more comfortable to work with. I'm also avidly awaiting the arrival of the ZX Next .. but have a pretty well-tricked out ZX Uno (FPGA)-based system to play with meantime.
I still feel like I should wire up my Enterprise128, CPC6128 and Spectrum +3 in some sort of incestuous cross-platform development environment one of these days. Seems like a hell of a lot of fun, to be writing Z80 code on Enterprise and transfer over to the other systems for running ..