Don't buy any TIG machine that you can not weld aluminum with. That's the beauty of TIG is that you can weld all metals (SS/Steel/Aluminum) because that's how we build our cars.
Aluminum takes lots of heat (AMPS) and you'll use thicker aluminum to build a bracket etc than that same bracket would be made with steel or stainless steel. Figure 1/4" - and size appropriately if you can afford it.
As you get better with MIG or TIG - you'll find yourself being LESS limited in the stuff you want to tackle.... so don't plan to limit yourself -- rather -- plan to have this machine for years and years and grow.
Having said all the above - I'm unfamiliar with the machine you're looking at. My comments are GENERAL about what to think about....
I'd rather have a used great machine than a useless new machine. We don't use these enough to EVER wear them out.
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