I'm in the same boat, but am looking hard at some of the side rail mounted options from vltor as well (which, of course, is irrelevant, as you probably have no side rails on your 700).
I have several of the Harris models that Canndo linked to. For me, those 6" to 9" models work great for shooting off a bench. I have a similar model from Caldwell. It looks and works like the Harris, and costs less, but it isn't as "beefy" or nicely finished.