They're all pricey. I don't know the model but the maker is good. They're all about output current in amps. there's a thread on plasma cutters in outfitting, no? Seems like this ought to move to outfitting, yes? YES!
I'd doubt that it'd cut 1/8" aluminum if rated cut is 1/4" in mild steel. They carry three ratings - fine (?), rated, and sever, each larger than the former. But I've yet to see one that'll live up to it's rating. I have a TA 38 that's rated to sever 5/8" - maybe my technique needs improvement.
Aluminum disperses (absorbs) heat much faster than steel so it's harder to focus the heat at the cut in it. All of them cut thinner in Aluminum than they'll cut in steel.
I've seen some smaller units struggle with schtuff that was less than the rated cutting thickness. Rust and paint/bondo have a negative effect. I got some wheels off an 18 wheeler to make a three-tier fire ring and the unit that was used blew right through anything.
I'll just play with it and see what it will do.
We have a Thermal Dynamics Portable Plasma Here at work, it's been around for Years, with no real trouble. The best Plasma cutters are Hypertherm, or have Hypertherm torches. Our Hypertherm portable unit is the unit of choice between the 80 odd fabricators here, although it is a larger unit.