i got a miller matic 220 at work and its an awesome machine. The New miller DVI welders are freakin great too, They can only go 3/8" but why would you be needing more then that anyways? Check it out, They got a special at the stores now for 1099.00 + Tax here the link
http://millerwelds.com/products/mig/millermatic_dvi/