Plasma rules!!! my dad uses one almost daily for roofing/construction, on a normal house, the plasma cutter takes a full day off the job...
decent plasma cutter: $1200
tips: $10
finishing all 5 day jobs in 4 days: priceless!!
I have his old one in my garage(cheap POS with built-in air source) it needs repair though... the cheap ones aren't meant for daily duty