I'm currently attending welding school, and while I weld plenty there I would like a machine I can run at home as well. Is the CST 280 a good choice for practicing out of position, 6g pipe( multiple sizes, and schedules, 7018 and 6010 both 5/32 max), and most importantly running tig roots? Lastly im assuming this machine is both DCEP and DCEN, is this correct?If not could you recommend some others.