How Much Is A Miller Welder

I just bought a new stock car and there are a few things i need to weld up.I need to weld on my roll cage which is is.095 dom steel tubing, and i need to weld some brackets on a ford 9 rear end housing.I am not going to use this welder every day just once in a while.I dont want to buy something that just wont do the job but i dont want to spend a fortune either.