1) Agree, resistors are a simple and elegant solution, and I had thought of them in addition to the Fan Mate. Which of the resistors you recommend, RC56 or RC100, should I install to lower the Penetrator RPM to 500?
In my experience, dedicated resistors/rheostats are better than PWM.
2) Sharkoon vibe-fixer mounts should suffice.
3) I'm not overclocking. I disagree about overkill. I think large or even very large heatsinks with slowly rotating fans--basically semi-passive cooling--are a good way to keep PCs quiet.
4) Vibe-Fixer mounts are convertible (see http://www.sharkoon.com/?q=en/content/vibe-fixer-pro
The 2.5" WD Scorpio Blue 500 GB I installed in one of my builds is quiet but not quiet enough: the Scorpio Blues need quiet mounts, in my opinion.
1) Kuzzia's resistor seems better than the Zalman Fan Mate (which I have used in other builds and like).
2) I agree that Solo II, despite well-known deficiencies, is a good choice, and I may use it in my next build.
3) HR-02 Macho with the TY-140 fan has the advantage over the Noctua in that the HR-02 allows more space for RAM sticks and larger hard disk drives. It has a height of 140mm so it should fit into the Temjin case without clearance problems. The fan is PWM, too, so I could control it over the mainboard.
I like Noctua heatsinks, though, and I bet the Noctua fan is more reliable than the TY-140.
4) I have used a 3.5 to 2 X 2.5-inch bay converter like the one you suggest, but probably not in this build. I'll be using both optical bays, one for an HDD power switch, the other for a Blu-Ray drive, so your suggestion, though a good one, isn't an option.
Thanks, Kuzzia and Abula.