I bought a Midwest industries 2 piece rail for my S&W. Nice rail for not a lot of money. It is fairly light and is robust despite being the 2 piece kind. However, I bought 2 of the Magpul MOE HGs (for my Colt and RRA/BCM mid) and really like them. I used the IWC Mount and Slot for a Surefire light and I am planning on using the IWC QD mount for a sling. Very nice set up and economical as well.
Another thing to consider is how much "stuff" do you plan on putting on the rail?? Most of that rail space is just that, space. It usually ends up being covered up by a panel or ladder of some sort.

