changing gear ratio from 3.23 to ? Street & Strip Experiences?

For the type of driving you want to do, 3.55's would be the logical choice. It would be the best compromise between dragstrip and autobahn driving. If you went with the 3.91's you risk making first gear useless due to much higher torque multiplication. First gear would be very short (3.25), and imo, would affect normal driveability in a negative way. As for autobahn driving, according to my calculations, at 4000 rpm (reasonable sustainable rpm) the 3.91 gear would be running ~110 mph. With the 3.55's the car would run ~122 mph at the same rpm, so there is quite a difference. I don't know if you looked at it this way, but these are the reasons I would personally choose the 3.55's over the 3.91 gears.