The AU24 SX are the real deal. Simply the best cable Audience has produced, period. Both TAS and now Enjoy The Music have concurred.
If you have to choose locations for your these cables, use the AU24 SX on your source connections first.
I would also say that the Ohno series is no slouch either. Better than AU24 SE and way cheaper. What it lacks in resolution over the 24 SE it makes up for in soundstage and musicality. Dollar for dollar the Ohno is the best budget cable one can buy.
DISCLAIMER: I am a dealer, but I also have a ton of experience with the Audience cables.