http://www.guitartricks.com/forum/showthread.php?t=28935&highlight=guitar+strap
My fave strap is a soft leather one that I paid 10 or 15 bucks for. It's about 2 and 1/2 inches wide. I think that thread might also have some discussion on the pros & cons of adding an additional strap pin.
...so ever since then, I always hang on to the buckle.