Before you get itchy and give me red, keep your pants on. This is not about whether someone should rent vs buy. I came across this fairly powerful calculator from the NY Times that helps answer that question. One of the really nice features is that you can actually set the rate of return on investments for any excess money you have that comes from renting vs buying (under the "Advanced General" settings).
I searched around and didn't see anything on this on FWF. Let me know if it's a repost and this thread can be deleted.

