I was dealing with similar fit questions in September and this thread helped me immensely
http://www.bikeforums.net/showthread...highlight=stem
as did this article
http://www2.trainingbible.com/joesbl...e-posture.html
As a result I tilted my saddle just a hair down from flat and lowered the height just a scoche, which makes it easier for me to tilt my pelvis to get that good back position. As a result I find I like a longer top tube, and take that into account when I look at how a frame fits me.