Sionlim,
My two cents worth: From what I have read, it sounds like your preference is toward warmth in your system. Mullard tubes are warm; Cardas Cross family of cables are warm. The Cardas Clear family is supposed to be more neutral - I have only heard the Cross family.
RCA tubes are not as warm as Mullard. I run RCA in my preamp. I used to run them in my amp but have since switched to all Telefunken. The Telefunkens are very clear. I have both smooth and rib plate versions of 12AX7 and 12AU7 that I got from Andy Bowman. I second too the recommendation made earlier in this thread about Andy. Compared to the tubes I have tried in my system (RCA, Mullard, Amperex, Tung Sol, Telefunken) I obviously preferred the Telefunken because that is all I now use. Between the smooth and rib plate Telefunkens, I prefer the rib plate as I find the leading and trailing edge of transients to be slightly crisper. The smooth plate ones are just a bit warmer, but I'm comparing Telefunkens - either one is clearer and more dynamic than anything else I've tried. And me hearing these differences came from swapping tubes back and forth and listening quite intently. In my headphone amp I use smooth plate EL84 and 12AX7 and love them. Anyway, I like Telefunken.
You also mentioned that you liked the Kimber 8TC. I am very familiar with Kimber. While the 8TC is very good, the 12TC gives better bass. I think it's a great value. My speaker cables are Kimber Select 3035, but if I wasn't using those cables, I would probably use the 12TC.
My best friend has the following system that I helped him assemble: Ayon Spirit-1, Rega Saturn CD, Silverline SR17.5 speakers in which I replaced the stock caps with Duelund VSF copper, Kimber 12TC speaker cable, Audio Magic old stock Sorcerer interconnects. He really likes his system.
