Don Scott has recommended running the following alignment specs a while back:
Caster +3.75 +/- .5
Camber - 3/8 +/- 1/8
Toe in +.03 - .06
I run this set up with the exception of negative camber at .75. I recently had the car aligned with a laser system and then had the corner weights set with me in the car. This is achieved by lowering or raising individual corners via coil over adjustments. Here are the weights I achieved with me in the car:
LF 743
RF 687
LR 750
RR 703
The goal here is to get the LF + the RR to be as close as possible to 50% of total weight. This balances the car. If you do the math, you will see that my cross diagonal weighting is 50.1%. If you are interested in this procedure, go here
http://www.grmotorsports.com/cornerweight.html
I had my car on a 2.2 mile road course 11/1/03 in Pahrump NV. Even with the temperature high of 60 degrees, my car was the most compliant it has ever been. The Goodyear stock car slicks I race on stuck better than they ever have. I attribute this to the corner weighting excercise coupled with swapping from stock MII control arms to the Bethania units (lot less flex now).