As with all these things buy the best you can afford. The difference in welding with a cheap set and then going to a mid range or semi-proffesional is very noticeable. I'm not an expert but have done enough to know that buying cheap is a waste of time. At least get one that will take a half sized bottle. Dont fuck about with the mini-sodastream sized bottles. Get an account with BOC and get a proper bottle. Once you have a welder you will find all sorts of shit to weld