The SD-73 Classic (OOB) will get going just a little earlier and be a bit more angular than the original Epic (because of its higher flare potential). It will also cover more boards (most likely 4-6 more). OOB, the SD-73 is strong, to say the least -- so I don't see any reason why it would not be able to fit above your Epic.
It doesn't hurt that the SD-73 Classic is one amazing ball...and that it takes quite well to surface adjustments!
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I am the University of Virginia's Bowling Team. After all, one All-American is all you need.