What amperages?

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So I'm new to welding and would like to get a nice reliable MIG that will be reliable and up to the job(I plan on welding sheet metal, go-kart frames, etc. small items) So I was wondering how large a mig I will need. I have been looking at the Hobart Handler 125 and handler 140, Would that be large enough?Also how about HF migs? I'm afraid they'd be unreliable if not too small...THANKS!
Reply:the hobart 140 is a nice mig to start out with, you can get it from northern tools..
Reply:If all you want to do is 1/8" and less, then the 140 is a nice machine. The problem is you will most likely quickly out grow it if you enjoy welding and want to move on to larger projects. A 220v machine in the 180 to 200 amp class is a better over all choice.Rather than rehash topics that have been covered to death,  take a bit and read thru a bunch of the threads linked in these two stickies. They have a number of threads that discuss the pros and cons on various starter migs and will give you a better understanding of what might be best for you.http://weldingweb.com/vbb/showthread.php?t=20883http://weldingweb.com/vbb/showthread.php?t=43760.No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:I don't why anybody would buy less than a 140 class machine if they could. Not everybody has the option of a small 240 volt machine but if you do you won't regret it. I consider anything smaller than a 140 class a sheet metal only machine. Sure they might do a little more but the duty cycle will be painfully short.Tough as nails and damn near as smart