Certified Plus are made by TDK
100% Certified can either be made by Ritek (more common) and Taiyo Yuden (less common but better to much better)
TDKs, Kodak, Mitsui's and Taiyo Yuden are among the best cdrs you can buy. Exceptionally stable media and complimentary to any system.
The trick is to find OEM cdrs made by the abovementioned mfg's for cheap. The winners over the last year are the TDK 2x50 pk spindle ID'd as Taiyo Yuden made from CompUSA and possibly Buy.com as some have reported to have received them there plus rebate. The other is the FujiFilm 80min cdrs in either single form, 30pk and 50pk spindles. I believe that BestBuy had rebates on them too some time ago.