With the price of acetylene, it might be worth looking into oxy propane setups. Costs a little more initially for the extra regulator and hoses, and isn't as portable, but everybody has an extra BBQ tank laying around, and oxygen refills are half the price. Bonus, you can also cut with it. If that's overkill, you can get a lot done (working with copper pipe, heating stuck bolts, etc.) with just a cheap handheld propane/Mapp torch, and it's cheap enough to keep a couple spare gas bottles around for when you inevitably run out on Saturday afternoon and the welding supply place isn't open again till Monday.