I am going to buy a small mig welder next week but I am not sure which to buy. Most of the welding I will be doing is 2 - 3mm box section.From reading the reviews I am considering a Clarke. Would I need the 150 amp or would the 130 be sufficient? Also, wondering whether to buy the EN ( gas/no gas) with a gas conversion kit, or the TE(gas only). Any thoughts on this would be much appreciated.