i voted miller
i have a old miller 200 no electronics that is very important to me plus i think miller makes the best products and i see them used the most
i bought mine 8 years ago for $800. all to gether ive got about $1200.with all the acc.
i also think even though the welder plasma cutter would be cool it would be like the tv/vcr/dvd player if one goes the whole thing is broke
dont get me wrong a plasma cutter is a awesome tool
good luck with what ever you choose