Can't go wrong with Mobil 1 at all but Royal Purple is pretty good stuff, lots of guys on the Audi and Corvette forums run it. Amsoil I've heard is also very comparable to Royal purple.
I'm currently running Mobile 1 though since its more readily available than RP or Amsoil and cheaper for the standard stuff
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04 Armada 20s with 35's Nitto RidgeGrapplers, Pinch Weld Mod, Titan 08+ 4x4 coils, Bilstein 5100s (middle setting), Rancho quicklift rear w/Raybestos 589-1150 coils, 22" Magnaflow exhaust, limo tint, Debadged, Billet grille, bull bar, rear brush guard, Armaden LED package, Torque Pro Vehicle monitoring via Nexus 7 indash tablet (CyanogenMod) ELM327 (OBDII-bluetooth), Viper Alarm, Die Hard Batt, Royal Purple Synthetics...lotsa plastidip
April 2012 Ride of the Month...