I have personally read the circulars for Williams Shooter's Supply which has a dealer price on the 1100 CM at under $650, which will (roughly) mean a retail of around $700. SX2 is about $100 more, and the Benelli Practical is about $150 more.
I'm interested in these tricked-out sub-$400 1100s these guys mention. Remington's Dealer price STARTS at over $400 before mods. If you can really land that package for that price, I suggest you go into business. You'll kick the gun world's #*%&!