I just purchased a Millermatic 210 and spoolgun package. Get it, as it is not that much more than the 175. As for the 251 or 350 much more expensive and if you want to weld aluminum the spool gun for the 251 is nearly a grand and ditto for the puch pull for the 350p. You can get a 210 with the spoolgun and tanks for the base price of the 251. This welder rocks, and as for the future, if you really need to upgrade later you can still get most of your money out of you first welder. Just one persepctive from sombody who does not have an unlimited supply of cash!!!