Looking for a decent mig welder - Cheap

I have a Lincoln 135 sp. It works fine except for the 20% duty cycle is too low; or maybe I am spoiled from using a Miller Tig at school. 110 volt seems to not be enough for me. I am always waiting for the welder to cool down.

It works fine for home use, I just happen to be doing alot of welding on cars lately and need a better duty cycle.

I am going to purchase a Miller TIG later this year and toss the Lincoln.