I use a Lincoln Promig 135 at the shop. While some will argue it's too small, I find it right handy to be able to put it on a standard wall outlet and weld.
While that welder will probably stick two pieces of metal together, flux core will NEVER do pretty work. It will splatter and spit and the weld pool doesn't push around like a gas mig weld pool. If I were you, I would save up a few more pennies and troll craigslist in your immediate area to try and find a lightly used 135-140 amp brand name (the names slick and braptor mentioned, hobart, lincoln, and miller) Mig welder. If you stick with flux core, you can weld thicker metals but not as pretty. If you want to buy a shield gas tank, you can make fairly deep welds on moderately thick material but do it very pretty.
I would not buy a mig welder which was not pre wired and plumbed for shielding gas even if I never had any intention of running it on gas. When I bought my welder I didn't intend to put it on gas and now I have a tank on it.