Its out of scope for what you asked about, however I must add to your thread that I love my Miller 210. Perhaps a used one on CraigsList would cost the same as a new 140? A 210 would be all you ever need in a MIG for auto type welding IMHO...

I do think you will get all you need for 95% of garage work with the smaller MIG you are looking at though, so not too big a deal on the upgrade to a 210 unless you can get a good used deal.