Up to now I have only used push gravers, but I want to start engraving nickel and 416 stainless. I have tried hammer chisel with limited success (very limited). I am thinking of investing in a power assist rig. The choices within my budget are #1 magnagraver $520 #2 the GRS system 3 price around $650 depending on compressor. ANY thoughts or advise would be greatly appreciated.