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Nobody is quoting extremes here, so no need for rhetorical statements like fans sounding like jet engines will give you plenty of airflow. If you have used a GT before, you will understand. They are in every sense, better than the NF-P12, so it's not true when you say that they are the best.
There is no denying that the NF-P12s are quiet, what they are not any better at is airflow. It compares with a low speed Yate Loon, which cost less than a quarter. There aren't that many other 50+ fans comparison review out there in the internet by the way, the objectivity of that review, I'll...
You are kidding right? The NF-P12 are nowhere as good as you've described them to be.
http://www.overclock.net/water-cooling/859483-round-6-fan-testing-working-thread.html
once again, you will appreciate the flexibility lens shift and good zoom gives you when it comes to projector placement. picture quality is somewhat overrated, it's not like you are always going to have 2 projectors side by side at home for you to appreciate the subtle differences in between them.
You can easily get an Epson 8350 on Amazon for about $1100. The HC4000 weak point compared to the Epson 8350 is the restricted placement options, due to lower zoom (1.5:1 vs 2.1:1), and no lens shift. This is a potential deal breaker factor for many as not everyone will be able to custom mount...
I think it's like this.
http://www.ergotron.com/Portals/0/tp/G/MX/888-45-155-W.pdf
In page 6, using the rails as per diagram C, but as the U3011 has a square 100x100 mounting holes, you offset the monitor to the right (when you face it from the rear), so that when you rotate it 90 degrees...
if you are looking for better temps, you need to do custom water cooling. the best AIO water cooling devices today are on par with the best air cooling devices, the H100 is not going to get any much better with any thermal compound.
your variable voltage power supply will do fine, just note that these DC fans require a certain amount of voltage before they can "kick start", thus supplying them with 6/5/2 V from the word go may not be enough for them to start spinning.
wall mount yes, desk mount no. i'm using a 27" on the MX desk mount, and in portrait mode the bottom of the monitor is flush with the table top, so a 30" should be out of the question.