First--I would visit a few local dealers of the gasses--"welding supply dealers"
You're going to have to deal with someone for refilling-(or swapping) your bottles. See what brands of torches they carry & price them..--You can buy them there or shop E-bay or elsewhere for the same brand---replacement parts are very seldom needed in torches, but later on the critical "O" rings in the jount require replacement.---A few years later they won't remember whether you bought it there or not, but if it is "their brand", they're much more likely to assist you with the parts. S*a*s , in the past has had a major mfgrs make their tools , but incorporate a few "bastard" sized components to force you to come back to them for parts.--Similar to the Wards cog-belt case in the other post..
I would definitely stay with one of the recognized brands , Victor, Oxy-weld, Etc. Stay away from imports !!.