We went with Raybestos Quiet Stop Ceramic (local parts house) for our 1999 DeVille Concours (16" wheels) and find them quiet but seemingly a bit less effective than the OEM Semi-metallic; so we elected to go with Hawk Performance Ceramic (when needed) for the 2005 SRX N*V8 (18" wheels).
Unfortunately, Hawk does not make them for the SRX 18" rear wheels.
We had heard good things about
www.autoanything.com who carries Hawk as well as other brands, so we purchased Hawk for the front and EBC Green Stuff (custom formulated for the rear in order to have them avail when needed, likely in the near future) in lieu of the EBC Red Stuff (formulated for souped-up speed demons)
Good luck !!