This is a good question; I bought a '68 Motobecane Grand Touring this summer and I'm going through the same process as you, trying to arrive at a more relaxed position that's still reasonably efficient. When I got the bike, the drops had already been replaced with 24" BMX bars. I had no interest in drops, but the BMX bars were practically without sweep and had 4" of rise. Mounted in the original SR 85mm stemn it looked odd and handled odd. I found a set of 'North Country-style' bars similar to those on old Raleigh tourers, and they've gotten me closer -- my hand positions are about 4 or 5 inches directly above where they'd be in the drops. I can still pedal pretty efficiently, but a lot more experimentation is needed. To that end, I'm going to install an adjustable quill-type stem. That ought to give me a large enough selection to find the right (or at least right enough) selection.