HTS5000 has 5 filter sections vs 4 in the 3500; same 10 outlets, but they can be selected to be always on, switched or delayed; 2775 joules vs 1300 for 3500; outlet on front, and apparently better filters. The 5000 is just $370 at www.global-mart.com; maybe if I leave an ad laying around, the wife will get me one for Xmas! What's the new Bond movie, "The World is not Enough?" I know that's true for us audiophile/videophile types.