Hi edrews!
I agree with MBSims comments on opting for a heavier duty power source if you're training a group of welders...
The Lincoln Precision TIG 275 package is an excellent choice...
The Miller Dynasty 300 DX is another excellent choice...
I also heard thermal Arc has a very decent machine that's reasonably priced...
I guess it comes down to economics sometimes in the choices people make when it comes to purchasing power sources that have reasonably good warranties and technical support so, ask your distributors (in other words, shop around) plenty of questions!
Best of luck with your choice!
Respectfully,
SSBN727
Run Silent... Run Deep!!!