If you can get it an M2 with a 28 inch barrell would be quite the ticket. That is what I have. I have used it for trap, 5-Stand, Sporting Clays, waterfowl hunting and upland bird hunting.
The only advantage that the SBE has to offer is the cpability to shoot 3.5 inch shells.
Be advised though that not all Benelli's will cycle the lighter clay loads. The SBE would be the worst for this and the M2 would be better. The Benelli reccomended minimum load is 3 dram eq and 1.125 ouce of shot. Yo would need to try the lighter loads in the gun you accquire before buying a whole bunch of them for practice.
Mike