You will need to put a filter on the intake fan due to the fact that it will be on carpet and will suck up dust.
As for the resevior, it would be much easier to build one with some PVC pipes. If you go for the manufactured resevior you will need to be sure it is mounted vertically on the case somewhere. You dont want to be sucking in any air (cavitation is BAD for pumps). Mounting it at the top of the case is good though, as the pump needs to be flooded for starting.
For the waterblock, really any one will do. The RBX will do fine, as will the swiftech 5000 series, the dtek whitewater, the TC-4, the spiral, the maze 3... ect. Whatever suits your pricerange. As you are cooling for silence, the waterblock decision isnt as important as radiator, fan, and pump. So, lets get this answering started:
1. The amount of airflow is reduced significantly, but it doesnt stop of course. Any amount of air flowing through the radiator will cool it, so having 30 cubic feet a minute is more than enough for decent cooling.
2. Get a fan with dual ball bearing. Panaflos by panasonic work great, so do the aluminum enermax fans. A rheostat of some kind to slow the fan down is also great for reducing noise.
3. That pump will be quiet, but I have experience with danner mags and they work absolutely beautifully. The mag 3 will out-perform that pump in every category, yet it will still be basically silent in operation. I cannot tell it is running by listening to it, I have to put my hand on the case and feel it running.
4. The resevior will likely have some kind of fill point as it is the most convienent to fill from. Typically, if the resevior is on top that is the best thing to fill from anyways. Also, you want the pump to be flooded before you get the liquid moving through the system or you could cause damage to the pump and create lots of annoying and performance degrading bubbles.
5.Not really, especially it they are restrictive. Typically, the CPU is the main object in the cooling loop and requires the most powerful cooling block and water combination. Adding restrictive blocks on the NB and GPU will rob this power if hooked up in series, but in parallel the flow will be much greater in the CPU area. This, of course, comes at a price. The GPU and NB will now only recieve half of the water used to cool the CPU, but the two do not produce much heat and therefore are not impaced as much.
6. Parallel waterblocks can be far more flow restrictive and still retain decent performance characteristics. You do, however, want to have similar designs utilized in both the GPU and NB as equal flow through both blocks is preferable. DTek and Polarflow use the same base for both their GPU and NB blocks and would therefore be ideal for this situation. Swiftech also manufacturers NB and GPU blocks with similar flow characteristics.
7. Your setup is great. You always want the resevior last in the sequence. My resevior connects directly to the pump inlet in a 1/2" NPT fitting (the largest size accomidatable (is that a word?
) for my particular pump-- it is much larger than 1/2" ID tubes) You typically want to avoid restricting the inlet of the pump and want either the radiator or the waterblocks first after the outlet of the pump. Other than that, route the tubing in the most convienent fashion or in a way that reduces the amount of 90 degree bends in your system.
I hope I have answered all the questions you asked.