he's right, you can't go wrong with a miller. Those $8K welders that my dad has are millers, and they get run non stop all day every day.
If you're a young guy like me however, then a couple hundred bucks makes a big difference. If you buy a miller, you'll pay twice as much for the same output. The extra cost is for the name "miller" to be printed on the side.
Spend some time comparing cost, duty cylce, and output. Also take notice of how many power settings they have, the more the better, continuous power setting is the best (infinite settings).
I'm not a Clark spokesperson or anything, but mine strikes a perfect arc immediately and can weld around 100 amps non stop. I boxed my frame and put in cross members, etc.