You really have to listen for yourself, but I would have to agree with the people that recommend the source to pre as the more important of the 2. That's just my opinion, based on my experience, though. I'm sure that there are exceptions, as well.
In my systems, for example, I tend to stick with Audioquest. I find that their silver IC's only sound good going from the CD player to the preamp and from my TT to my phono pre. Anywhere else, they don't sound as good as the copper IC's do; even going from my phono pre to my preamp. I have no idea why, but thatÂ’s just how it is.