Which to install 391 rearend gear or lower?

Another vote for 3.55's. Starting to get tired of the 3.91's in my car, so I'm going to 3.55's sometime in the next month or so. 3000 RPM at 60 mph with 27 inch tall tires with the 3.91's. Great for driving around town, but for trips longer than 15 miles, that 3000 RPM sound starts to get to you.