I think Salvatore offers some interesting information and advice. Especially if you are interested in tubes and are willing to buy used. For example, he does not have positive things to say about the Audio Research Reference pre-amps. I have a Ref 1 which was about $10,000 new. I bought if from a friend for $2,000 (it is 10 years old but in almost mint condition). I almost did not buy it because of comments by Salvatore and also Drew (Moon Audio) who told me that he found the AR stuff too dry and analytical. But for 2k, it was too good of a deal to pass up. I think Salvatore would suggest that when the Ref 1 has something go wrong with it that I send it to someone to modify the power supply, etc.
Another component that he recommends is Quicksilver. Before I purchased the Ref 1, I was looking at Quicksilver (and Rogue). My problem was the input impedance of my power amp is relatively low. I e-mailed Quicksilver and the owner respond with a recommendation that I not buy his pre-amp to use with my solid state power amp.
If I had to do over again, I might have purchased a Quicksilver Pre-amp and a set of matching tube mono-blocks. But with the Dynaudio speakers I purchased, a tube power amp is probably not a possibility.
I think we have to take everyone's opinion for what it is: opinion. I read reviews all over the web and some magazines. I may eventually buy a tube CD player (in addition to the Denon, I have a Music Hall CD-25 which sounds great esp. on HDCD disks, a Pioneer Elite AV-45, and an older Cambridge player). I think the Denon and the Music Hall sound the best. I might buy a Cayin or a Doge or something made in the US if it is affordable. I am not spending more than about $1500 because I can't afford it (or can't afford my wife's disapproval).
Also, a CD player would be the one component I would be very reluctant to buy used. Unless I knew the person that I was buying it from. I would also like to hear about the Doge. I almost bought the Doge head phone amp based on reviews on Head-fi before I picked up the Cayin.