Ya, I generally don't purchase Energy products unless I get them for at least half of whatever the normal retail for them is at the time.
I also thought of replacing my c-500s with some cf-50s or cf70s thinking the CF might be superior (some people think so some people don't), and I can get them real cheap, But I am sure I would have simiilar timbre matching issues, and after listening to cf, I actually prefer the sound of the c series over cf. Although I have not been able to do a fair listening test in my actual listening environment. Has anyone else heard both?
I think the easiest thing for me to do is build a second setup just for music, and just grab a pair of RC 50s. (I know what they sound like already and I like them.)