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First, you don't need metal door frames if you build a solid wall (you know, with jack-studs and headers). You do need solid core doors and a good seal.
Second, don't use a single frame for the doors. Build a frame in each of the isolated walls (use offset studs if you must, but around the doors the plates need to be 2x8s). If you use the same studs to support both doors, the sound will couple from one door the other through the structure.
Rockwool and rigid fiberglass (Corning 702) are cheaper than sonex and probably work better on the doors. Also, adding some bracing to one of the doors can help by changing the resonance. That way the two doors don't pass the same frequencies by resonating alike.
-tINY
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