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Keep in mind that if you want to weld aluminum with a TIG, you will need an machine capable of AC.
For all that you plan to do, I'm thinking the MIG 140 would be the way to go. I have a Millermatic 135 and it is a sweet machine. I've used the heck out of it and pushed it to it's limit many times and it hasn't given me a bit of trouble.
Bob
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