I believe my R1 E-line rotors were cheaper on their website than ebay. I went with Wagner Thermo Quiet pads from Advance Auto.
http://www.r1concepts.com/elinerotors.php Unless you are road racing, the E-line of rotors will hold up to street car use. Check this post for R1's response when I asked the difference in their rotors.
http://www.grandprix.net/ubb/ultimatebb.php?ubb=get_topic;f=1;t=010293#000007
_________________________
03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator