Silver really does work with MAPP, on racks and such. When it is right it just pops in a fillet perfectly formed.

One thing to consider when using cheap aspirated burners is that it is difficult to control flame quality. You want a carborating flame that does not add oxygen to the metal. To get that you need an adjustable jet, and most of the hand helds do not have that. It also pays to have massive overkill in BTU, so you don't need to just go to an oxidizing flame to max out the BTUs. There are fairly cheap burners of this type, but they are hardly worth it, since one can normally get an Oxy set up for reasonably cheap, and then have it all.

I use a propane torch, and bottled gas. I would love to use nat gas, and a concentrator, to completely eliminate the high pressure tanks.