hey smith torches top notch and two stage regulator not ness a sary . I have the large purox torch and its two heavy for brazing one hand holding torch and the other the brass rod.. also most torches can use propane instead acetylene by changing tip. larger tanks 120 and 300 are best last longer and as above pressure drop etc.
victor is great and every one copy cat the torches so tips that fit are at every welding store goss tips are good.