My suggestion from past experiences would be to go with the welder that has the best support (Service people) in your area.
In most areas this happens to be Miller which are normally sold through welding supply stores as apposed to the Lincolns which in this area are sold a Home Depot. There isn't a lot of repair service available there.
Anyone who uses a wirefeed very much will tell you that sooner or later you will have to haul it in for service or have to buy a part for it.
At any rate go with a Miller, Hobart, or Lincoln and stay away from the off brands simply due to the availibility of parts and service.