I have been looking at welders for shop I'm building at my place.  We already have Miller 251 MIG in the shop at Dad's house along with a smaller MIG and the old firebox.   I've always thought it would be nice to have a TIG to handle the little bit of aluminum and stainless welding we need to do.  Scouring ebay and craigslist multi-process machines with wire feeders seem to be a pretty good value, 90% of what we do will be gas shielded MIG work.  Will I be happy with a multi-process or would it be better to just buy a dedicated machine for MIG, TIG, Stick? 

Looking at Miller XMT or Lincoln powerwave machine...