Suggestion...
I suggest you pick up a copy of Donald Schlesinger's book "Blackjack Attack, 3rd edition" -- available through the bookstore on this site (see the left panel). He has pages and pages of data that answer this question in detail.
The top systems are AOII, UBZ, HI-OPTII and Halves. You can really just pick one. I use Halves.
--Mayor
