If you look at pix of professional road racers, that, essentially is how they set
up their bikes. It is fairly common for pros to have frames that are 2-3cm smaller than what you would expect for their heighth, allowing the seat to be elevated to 4" above the stem. Since these guys have 2-5% bodyfat they can ride with their back parallel to the ground or even with a down slope back: sacrum higher than neck for high speed descents. unless you want a really uprite posture you will end up with the seat 1-2" higher than the bar. Look around at the next group ride and you will see a fair number of bikes with the seat 3" above the bar. Steve