My experience with high end audio has been that each significant upgrade I have made of high end main stream audio components has resulted in a great improvement on my system. I agree that it is very helpful to know what sonic characteristics you value. But, you need an experience base to really understand what the choices are. In the case of a preamp and what we know about the poster, I think the ARC is a very safe bet for this person. Now if it was speakers or an amp, much more information would be required.
I agree that we have different values… and that is fine.