What percentage of the engines built here go into any application other than demonstrations? Not a criticism, but building them for the sake of building them seems to be ok.
Carter Tools mentioned above is the best Taig resource out there. Nick Carter is very helpful, answers his emails quickly and has a great knowledge of the lathe.mm
If'n you are going to carry, the Taig is nice and light minus the motor. Never used a Seig, but I think they can cut threads if that is important to you.
My Taig mill and lathe are on a bench in the corner of my 8' x 12' shed, on a 30" x 24" bench. My recommendation is have the ground floor, acoustic foam on the walls and ceiling, and wood floors with a tough finish.