My favorite gear to date is the 4.56 gear with a 27" tire and an overdrive. Car feels like a rocketship (though technically still slow) and did well with the overdrive. Even drove to Salt Lake City at 80mph on I-80 at 3200rpm for a hundred miles each way.
Currently have 3.42's and they are pretty decent, but have another set of 4.56's ready to go back in.
My car has a 200-4r in it for an overdrive.
Interestingly enough, a bunch of my friends that run single digits in the 1/4 have been switching to a powerglide with gear vendors on the back and gearing appropriately for the gear vendors to shift going down the track.
