Actually I've called a few of the local dealers and they have the pricing sheets for the '04. I've only priced the left handed models though so I'm not much help on the righty versions
Also, try http://www.shotgunworld.com . Im sure the question has been asked and answered before. if not im sure they'd be quick to answer it on that forum.
As for the M1 not cycling light loads, I've read in a few places that for the benellis you should cycle 100 loads of high brass through them first and then it will work fine. I am waiting on my lefty M2 so I dont know that for fact yet