I am new to mig welding, but have quickly come to realise that I can't afford to learn using costly disposable bottles and would appreciate soem advice. It would appear that southwestgas or Hobbyweld are my options in Belfast. I would be interested to know which is likely to work out cheaper. I also assume that I would have to buy a new regulator. Would this work with the thin straw-like tube that came with the welder?