/6 with 4 Speed OD, rear gear recommendations?

I have a similar setup in my /6, and I'm planning to switch to a 3.23 ratio. Like you, I'm not a tire-screecher, and am looking to retain the awesome MPG I'm getting with the 4-speed OD and stock rear gears(2.76?). Most people like the 3.55 and up, but they might be more concerned about launch speed.