I don't mean internet people I've read about I mean real people I have met and worked with. Are you telling the original poster that he will be alright to buy a DC tig to weld his aluminium ? If not I can't see the logic in continuing this.
I certainly wouldn't recommend that the original poster buy a DC set for Ali work, for an occasional welder it would be entirely impractical, The only issue I have is with the statement that Aluminium cannot be DC Tig welded, when in reality it most certainly can be and to a very high standard.