Im not endorsing the ASA (American Seniors Assoc.) although I did join them a couple of months ago, it might be worth your while if you are thinking of dumping AARP (which I did 5 years ago) to check them out and then you can decide for yourself.
http://www.americanseniors.org/Pages/home.aspx?Images=/images/index_new.gif
As an incentive, rather than just tear up your AARP Card, if you send it to ASA and join, you will get second year membership free.