3.55 vs 3.91

I think 3.55's with the A999 would be a great all-around gear to use. Especially if you're mainly street driving with trips on the freeway. And you'll definitely feel the difference from 2.76 gears.

I currently have 3.23 's with A999 and 26.5 (245/60R15) tires and my RPM settles around 2700 at 65 mph. I can still squeal the tire off the line if I wanted to.

I'm planning on putting 3.55's later on and using 27 inch tires (255/60R15 tires). That should put at about 2900 at 65 mph.
Long term planning for gear vendors should put that RPM down even further at 2300. (but at $2800 I'm only dreamin' for now)