Every welding method has its own advantages and disadvantages. I have a Miller 175 MIG and I love it. I run it only with solid wire and argon mix gas. Currently it is now sold as the 180 I think because Lincoln has a competitive machine and it is a 180 job. Right now in my area the Miller 180 with a cart and full bottle of argon is just under $1000.00. When I bought the 175 I didn't even consider a 120 volt machine or flux cored wire even though I could have saved a fair amount of money.
I also have a Lincoln 225 AC stick machine that I've owned since 1970. 7018 AC rod gives a good finish but not anything like a MIG or TIG and I often use it where I don't want any question as to the penetration and overall strength of the weld. Think about it for a moment. When was the last time you saw a ship being built with MIG or TIG. Like I said. They all have their uses. You know best what your welding skills and budget can handle.
One of the better brochures I have seen that explains all of the welding processes and skills needed for each is put out by Miller Electric in their 2007 catalog which is free at your local welding supply. It can help you decide on both the machine and the process.
