Have a look at this site:
http://mototuneusa.com/break_in_secrets.htm
There's a lot of good information and this chap emphasizes NOT using synthetic during break-in. Whether-or-not you agree with everything, I think it has a lot to think about.
ALSO, check out "Patman" on LS1tech. Try searching "oil analysis." I can't find the post I was originally thinking of, but I thought he had made a spreadsheet, of sorts, that had a lot of comparisons between several brands with the results of lab testing on his engine oil. It was very interesting.
Ooo... I found this too:
http://www.bobistheoilguy.com/