Owning a VT220/VT320 original has been on my "someday" list for a long time, they rarely appear in the UK though and are expensive enough when they do that I can never quite bring myself to pull the trigger on what would effectively be an "art" installation in the corner of my office.
The hard part is the casing/keyboard/screen that replicates the original, but offers modern connectors, power consumption, etc.