Lincoln SP135t
It's 110v, has "infinite" heat and speed settings, and will handle pretty much anything you'll face on an Opel. It's a good brand, easy to get replacement parts, etc., and not terribly expensive. Get a CO2/Argon tank and you'll find it doesn't take long to lay down decent welds.
I'm sure others will chime in with similar units, each with their own advantages. Search the site here as well, as I think this has been discussed (at least in brief) in thte past.
Todd



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