If you do not already have the receiver you may think really hard about going with one of the custom receivers instead. I have been working with Borden Timberline Magnum receivers and they are simply the best receiver in this class I have ever used.
They come set up for the Edge including the extended Wyatts mag box window. They are a bit more then a Rem 700 but not by much when you figure in all the work needed to accurize a Rem 700 to get it ready to build on and in the end, you still have a Rem 700.
Do not get me wrong, the Rem 700 is a great receiver and easily the best factory receiver out there but it can not compare to a Borden receiver even if properly accurized.
Again, if you own a Rem 700, its not worth it but if you have to trade or pay for a donor receiver, looking at a custom receiver may be something you thought was out of your price range but really its not when you look at what you get right out of the box.
The Stiller receivers also can be ordered ready to roll with the extended mag box and again is a good custom receiver option. Just a thought if you do not already have the receiver.
Again, the Borden Timberline is the very best receiver I have used in this size class. Works with all Rem 700 accessaries and stocks as well.