If your friends have heard you say "They can take my 8 speed drivetrain away when they pry it from my cold dead hands." then SRAM might be able to help... keep your 8 speed running that is, not take it away. The PG-820 has PowerGlide technology and comes in sizes up to 32t.
This cassette feels great and shifts better. For the price it cannot be beat. I am very happy with it and hope it continues to work as well as it does now.