RE: shotty purchase
I have a Nova and love it. I have had it for about 3 or 4 years and have had no problems with it. Well one problem, but that was my fault.
I took the trigger assembly apart to switch the safety to left handed. I got the instructions from benelli on how to do this. Of course once I knew the instructions were available and in the mail I went head and started with out them. I figured I could always use the instructions to get the gun back together when they arrived (typical for me as I am an adventurous soul). Anyway I lost a spring. You know how it goes you hear a ~ping~ and the next thing you know you are on your hands and knees looking for a spring the size of you pinky nail.
Now I told you that story to tell you this story. To replace the spring I didn't find back I called the customer service number and they gave me a number to call. As it turns out it was Bownells. I called them gave them the part number and they charged $5 dollars to my credit card. 2 days later the spring came in the mail. I got the gun back together and the safety worked in the new lefty configuration. The moral to my story is I didn't find the part difficult to get what so ever as another person posted earlier.
If you don't like the Nova nothing I say will change your mind but make no mistake about it the Nova is a fine firearm and a good choice for someone that wants a good pump. Of course I wish they could be a little more flashy with a wood stock and forearm. Sure I like that look but I can tell you this much, the Nova is very rugged the way it is and will last a long time.
In your case I would go with the M2 unless you needed the 3 1/2 chamber I do know the sbe has had some difficulty with some light loads I don't know if the m2 has seen the same problems.