Well, it is really a hard choice. I audition them in FS with HK AVR247. No doubt that RTi8 is much brighter, but the C500 is also a bit too laid back. I tried out different types of musics including orchestra, pop song, Kenny G, guitas .. and for those music that stress on mid and vocols (Kenny G and pop songs), the RTi8 sounds better. It sounds more lively and more imagery. However, there are also places that the high sounds like out of control. The C500 don't have this problem, but it sounds more flat, and a bit dull sometimes. Having said that, I still pick C500 .. because those out of control sections kind of bug me. So, I think I will return my RTi8.