i got a Sealey supermig, its 195amps so will weld 8-9mil mild steel and realy rate it. You should be looking for one that goes down to about 35amps and goes upto 135amps to be able to do chassis work any less than that and you wiont be getting good penetration. I know the people on the http://www.mig-welding.co.uk/forum/index.php rate the clarke migs for diy use so if its up to the job why don't you just treat it to some new consumables as £600 won't get you much for a pro user one like cebora, murex and the like. But what ever you do DONT BUY a Sip!