Two cents...
I chose the TKO over a 6-speed also.
I had 3.89's with my 5-speed and highway driving was very comfortable with one overdrive. But final drive wasn't an issue, it was 1st gear. The 5 and 6 speed transmissions share the same 1st gear: 3.27:1. After my first drive I immediately yanked the 3.89's and swapped in 3.25's.
Frankly, the combination of a 3.27 1st gear and 3.89 rear gears is bad. Read my "Driving Impressions" thread. With the engine you speak of you won't need the torque mulitplication of a steep gear, anyway. So why suffer with an ultra-granny first gear?
IMHO, putting in a rear gear that matches the 3.27 first gear would result in a 6th gear cruise rpm just above idle, and that's just no fun.
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