I finally realized why I was getting some bad welds, the welder was giving up. No indication except for a crappy weld right after good ones. The gun was starting to get wonky as well, so looked at new guns....Wow, you have some nice Miller equipment there! My Hobart Ironman 250 has a very good duty cycle, I've never had it shut down on me even on thicker stock. My plasma torch is a Hypertherm 45 which is compatible with a CNC table with the appropriate torch.
I did a bunch of looking at other welders the next step up. I looked at the 250, thinking it is better than the MVP. The "deal" on this one made it the choice. I like lots of the features, I am yet to try pulse MIG, should be interesting. I need a different mix tank for that. The gun is worlds better, and the 15' cord on the gun.
The plasma I have had for years, it works great as well. Looked at others at the time and this was not much more. More choices now, not sure what I would pick now. Its been great though.