Is my impression correct that the 880/881s up front provide slightly over 2" of lift and the 890/891s in the rear provide closer to 3" (thus the need for a 1" spacer up front)?

I might try the 880/881s with no spacer and 906s in the rear along with a set of 265/75R16 (32") Dueler ATs and see how it works on the trail. Taking the leap to a 3" lift and 33" mud terrains might be too much of compromise on driveability and gas mileage with the stock 4.10 gears, not to mention the crawl ratio won't exactly be desireable since I have a manual trans.

I want the suspension to be slightly stiffer (~20%) than it is now--if I should be going a different route such as the Tundra TRD coilover setup up front in lieu of the OMEs, let me know!