Fft:
I bought a Lincoln Weld Pak 100HD(is upgradeable to gas) at Lowes for like $450, it's 110, I used it as flux-core for around a year, then upgraded it to gas ($130 package), and have been much happier since. Flux-core is ok, it's welds like a stick-welder as far as splatter goes.
I've used it for weldin 1/4" steel and as long as you have your heat maxed and wire speed where you like it, it'll burn in with good penetration long as you take your time. I spotted my rear axle mod & spring perches, then had a professional welder friend of mine finish up the job with his BIG 220 unit. He told me that as clean as I had the metal & burned in good with the spots, he told me I could of finished the job myself. Told him with my mod & V8 power, wasn't taken any chances!