In comparing ticket prices last week, I found AAA to be the cheapest. For 10 days w/ "the works" (PH, NoExp, WPF&M) it was 618 including tax. That's $10 cheaper than UT.
Another thing to consider is if you are planning two or more shorter trips whose total major park days are equal or less than 10, and you have the financial resources to do it, buy the longer passes and split them between your trips.
The YES program seems interesting but it is unfortunately not offered while we will be there.
It seems like buying tickets through Disney, while it may be convenient, is not the wisest financial decision. (with the exclusion of certain promos)