I've felt this way since I built my last desktop in 2008. I was sort-of waiting for the "gee its time to upgrade" mark to roll around in 3 or 4 years, but it hasn't happened yet. Any games I want to play it still runs very well, and it still feels very fast to me even compared to modern off-the-shelf systems. When my friends ask for laptop-buying advice I tell them if they like the keyboard and screen, then its just…
I would pay for a silent PC. I paid a lot for a quiet Apple PowerPC Mac pro back in the day and built a quiet PC but they are not silent and I have moved to a quieter place and I can hear them (yes the Mac runs Fedora now). I have some silent ARM machines but they don't quite cut it yet though maybe the new quad core one will.
I haven't used a Puget machine myself, but I've relied on Silent PC Review's component recommendations for nearly a decade, and never been disappointed.