I use Techron every-so-often. I use STP's Grey bottle for the fuel system, and black bottle for the injectors. I'm gonna switch to Amsoil's Performance Improver for the Injectors (They have a prefered customer program that sells at wholesale...not bad!) and use the Berrymans & STP in rotation for the fuel system every ~3000 miles.
As far as oils though, I am gonna switch to Amsoil sytheics everywhere. Their motor oil is superior, their gear lube is amazing and doesn't require LS additives (if you need it, i don't). Their greases are great too.