I have a Hobart 210mvp. It will run on either 110 or 220 volts. It is rated for 3/8 single pass, but that doesn't that doesn't mean you can't ever weld anything thicker. You just have to make your joint right and maybe use more than one pass. Honestly, for automotive work you will rarely have anything thicker than 1/4, so something like the Hobart 210 or miller 211 will be more than adequate for automotive work, with enough extra capacity to do some occasional 3/8 or 1/2. The hobart 210 and miller 211 can run on either 110 volt (although not at full capacity) or 220 volt, so that may be an option for you. The Hobart and miller use the same drive system and torch, but use different electronics, Hobart has stepped voltage control, and the miller has variable voltage control.
As for flux core wire/no gas vs solid wire/gas, the advantage for flux core wire is that it is more tolorant for dirty or rusty metal,
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