Recommended portable/cheap welder for emergency fixes?

I've got a couple nice Millers for my shop, but I'm looking to add a portable welder for my travel fix-it kit. I know some of the cheap welders coming out of China are actually pretty good these days, but I'm not sure which brands are worth considering. I'd like something that I can run off 120v, but able to use more power when 240v is available would be nice. Was also hoping for Mig+Tig. Plasma would be nice, but not essential. I'd love to spend less than $300.

Any recommendations out there that fit? Located in the US.