I had a mini-lathe and quickly outgrew it. I now had a 12x36 which is as small as I would suggest for serious work.
I still have a mini mill, but at least it is one of the few that has an R8 spindle, so I can use 'standard' tooling with it.
I never likes the Rancharo or the El Camino because I couldn't figure out if they were cars trying to be pick-up trucks, or pick-up trucks trying to be cars. I felt that they weren't much of either.
I think the same is true for the combination machines. If I were forced to get one, I would get the largest one that Smithy makes - I think they have a better reputation than Grizzly