Howdy, I would Highly recommend the 200DX as your first Everlast unit. I currently have the 250EX and the 185 Micro. Although I think the 185 Micro would take care of tour TIG needs nicely and without issue, I think the added feature of being able to plug in a stick electrode for those heavier situations would be worth the extra couple of bucks. Don't worry about pre-flow, I have that setting on my 250EX and keep it near zero. I just tap the pedal a few inches away from the material to get the argon flowing consistently, bring down to the workpiece, and go to work. This has the added benefit of letting you verify on that first arc of the day that you remembered to turn the gas on (don't ask how I would know).
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If I had a crystal ball, I would guess it would show you being surprised by the amount of aluminum projects that fall into your lap. That being said, another possible option is the MTS line. This would allow you to MIG any aluminum with .040" wire, and gives you MIG, TIG, AND Stick, all in one tidy, economical package. So much so, that one of the bigger manufacturers has a similar unit being made in tha same factory (with a much higher price, less features, and minus the Everlast 5 year warranty. I plan in getting one of these units in to evaluate, and if my business plan allows it, I will mount it in my truck with a generator for field repairs.
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As far as plasma goes, I have no direct experience with the Supercut50 or the PowerPlasma50, but there is at least one you-tube video doing a direct, side-by-side comparison between the two, and in the video, the PowerPlasma edges out the Supercut, but they both get the job done. Even though the supercut still has MOSFET technology, it's a good unit, and there's thousands of them in the field with happy owners, or they wouldn't still be offered (with a 5 yr. warranty, I might add). If you opt for the PU205, you're going into a multi-purpose unit, spending more money, and getting capabilities you will already have, welding-wise. Again, I have no direct experience with the unit, but if money is a factor, it's something to consider.
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Bottom line, If I was in your shoes, and AC TIG wasn't an absolute deal breaker, and I could use aluminum MIG, a possible suggestion would be to go for the MTS200 for $999.00 and the SuperCut50 for $649.00 Total LIST price of $1649.00 With this suggestion, you would lose AC TIG, But gain MIG, which can be used for aluminum. I am currently NOT a MIG guy, but it's up there on my list, and were it not for the ESAB MigMaster 250 gathering dust in the corner of my shop, this looks like a great place to start.
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Another Suggestion is to just spring for the PowerPro205. Here, $1549.00 (list) gets you AC/DC TIG, Stick, AND a 50 amp, pilot arc, IGBT fired plasma cutter, all rolled up in one tidy, neat package. Were I in your shoes, in this situation, the extra $$ you save would come close to affording you the water cooler AND the WP20 torch upgrade. I opted for the water cooler and Everlast WP20 torch with my 250EX, and all I have to say about it is that it's AWESOME! I have even went so far as to buy an adapter setup to run the WP20 on my 185 Micro, and it changes the personality of the machine, just by having the additional comfort level of a small torch.
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Good luck with whatever you decide to do!