I have a Hobart MIG 125 with a gas kit. I got the sheilding gas, a kart, and a auto darkening helmet. I'm a beginner and I think I have about $500 total invested and I think this is a great place to start. From one novice to another.
Actually, it was a 125 back when I got mine. Now it looks like they called it a 140. This is the welder I have and most of the same accessories...
http://www.sears.com/shc/s/p_10153_12605_00930081000P?vName=Tools&keyword=hobart+welder