Dadnatron get the multiprocess machine. You said it many times in this thread. You have projects. You have needs, repairs, modifications that will make things more usable. And projects are piling up.
Don't set the eqpt bar too high. If you run up against the limits of a multiprocess welder then buy the next machine. By then you will have done so many repairs the multiprocess machine becomes free at that point. The multiprocess machine makes it more likely you will learn 3 types of welding, if that is interesting to you. It sure worked for me. The only complaint I have with mine (Miller MultiMatic 200) is itt doesn't have AC TIG. Which I never knew I needed, but now I know because I dove in.
Pros are not the right people to ask about multiprocess because they HAVE the separate machines, thus no NEEDs. Why would it be any other way? Keep in mind you're not a pro, their needs are not yours. You needs are NOW.
My sister-in-law wants me to advise her what cordless drill to buy. I can't advise her because anything she actually needs is a peice of junk and the only ones I can bring myself to recommend are ones I'd want for myself, and they too will just go to waste (unused) in her hands. Thus I can't advise at all; if its not to "overbuy". The forum is like that, overwhelming pressure to overbuy. Best to just get going.
If you look at the activity on this forum its the guys who HAVE projects who are doing/learning. Thats the way it is. Buy the dang thing; I wanna see your projects! Didn't Henry Ford say something notable re: failure to buy a tool after you identified the need costs twice as much as just buying it? He was a smart man, prob didn't overbuy though.