I am planning on purchasing a small welder since my Miller 251 is a pain to take out on the field and only uses 220 v. I was planning on the Miller 135 but now see they have a new machine, the Miller Passport. The Passport is smaller than the 135, can use 110 or 220 and is like a suitcase you can carry around. The Passport is rated at 130 A at 60% Duty Cycle when using 220V. and 110 A at 20% Duty Cycle when using 110V. The 135 is rated at 90 Amps at 20% Duty Cycle when using 110v. The Passport sure looks nice, but at $1350 is more than twice the cost of the 135 at $625. Any input? I'm not a welding mad man, I do it from time to time on the trucks, and at work. I need something smaller than the 251. I'm worried that if I get the 135 I will regret it in the future if I end up needing the extra power of the Passport. Thanks, Eric M.