definitely do not even consider running beast with epistane... not at all...
if you were wanting to do a stack with beast, and my assumption is that you want extra leaness or you wouldn't have brought up epi, then you would stack beast and katana... beast, katana and transaderm together would be a sweet cycle...
i do agree with the aforementioned ideas though that beast would be a fucking sick kick for any test cycles... you would see huge gains...
if your not ready for that, then you can still get awesome gains with beast as a stand alone or stacked like i said...