So I'll answer my own question and say that SheetCam is the answer. It just works! And it works on my older machine just fine too.
I had Qcad, SheetCam and Mach3 open with no issue. Though if you have the dxf drawn already, you don't need Qcad open.
Once you have your tool parameters saved it takes about 4 clicks of your mouse to go from your dfx to a saved gcode file and each one has run in mach3 flawlessly so far.