Sorry, but the whole "always put a radiator between blocks" thing is a(n admittedly hard to kill) misconception. Myself, and a few other members at OCN, have tested this quite thoroughly, and none of us have seen more than a 1*C variation in Delta-T temps regardless of radiator placement. This is with some pretty extensive temp measuring equipment, and measuring the in/out water temps of each block and rad in each of our loops (that's >10 temp sensors for my loop, some had more, others less). Couple that with thermal probes and quality IR thermometers (Fluke units for me), and I am comfortable saying that the testing was quite thorough.
THE ONLY RULES for loop layout are as follows:
1) ALWAYS place the pump below the reservoir, and the reservoir feeding directly into the pump without anything in-between
2) Route the tubing whichever way requires the least amount, has NO sharp bends/kinks, is most convenient, and most aesthetically pleasing
That's it, that's all the rules there are. Everything else is subjective/opinion, or based on misinformation.
Also, if you're going dual DDC pumps, to this day the Swiftech MCP35x2 top (as in, the stock/original top) is the best performing dual DDC top out there. No reason to spend more, for less.
However, keep in mind that there is no benefit outside of redundancy (in case one pump fails, the other still works), to having multiple pumps if you're already around the 1GPM mark. Increasing flow beyond this does not reduce temperatures "an automatic 3-7 degrees" or anything like that; in fact, with the D5, you can actually end up negating the temperature benefit due to the fact that, unlike the DDC pumps, D5's are cooled directly by the water they are pumping. The result is that while DDC's (being primarily air cooled) only put about 5-10% of their heat into the water (maximum), D5's put 90-95% or more of the 30W+ heat into the water. Now, that doesn't matter much at all when you're running 4x Monsta 560's and a few more rads, but when you're running a low rad space to component ratio loop, 30+ watts is a significant amount.
As to whether or not you would benefit from more radiator space? Absolutely!
I have personally found 140mm-fan based radiators to be a fairly significant improvement over 120mm fan based rads, especially now that 140mm quality fans aren't difficult to find at all. Just to give you an example of the benefits.... A 3x140mm radiator (420) has MORE surface area than a 4x120mm rad (480) just by pure measurements. However, consider that the 420 requires 3 fans, while the 480 requires 4; this might not seem like much, but remember each fan has a dead spot in the center, so a 480 has a full 33% increase in "dead spots" over a 420. Also, the "swept area" to "dead area" of a 140 fan is usually quite a bit better (that is, area covered by spinning fan blades vs area covered/blocked by fan hub and frame).
All told, using equivalent fans on the same model radiators with the only difference being 120 vs 140, I consistently record about a 15-20% performance benefit for the 420 vs the 480. (this is with both UT60 420 vs 480 and Monsta 420 vs 480, using fans with 3.5mmH2O static pressure and 88-93cfm).
As for fans, static pressure is the most important thing for a radiator fan, bar none. Noise is subjective, so while I don't mind the noise from my insanely awesome Koolance fans (5.4mmH2O, 106cfm) due to the performance, other people would (although many people have been quite surprised at just how quiet they are).
Out of the fans on your list, despite my dislike for the company itself, the Corsair SP120PE are undoubtedly the best performer. Noctua are DECENT with MODERATE/ACCEPTABLE performance, they're just really quiet; they are NOT the way to go if you're limited on rad space and want great temps!
If you want a quiet rig, you need to increase the amount of radiator space (and my suggestion is to utilize push-pull fans, regardless, as you can run lower speeds while the temps still benefit) or accept poor temperature performance.
For your system, if it were my setup, I'd be running a MINIMUM of something like a UT60 420 + 240/280, so in your case, already having a 360 rad (I really like the XSPC EX rads myself), a 420 UT60 would be perfect in terms of allowing you to run quietly with good performance, or increase fan speed for GREAT temps!
Here is a picture, not as clean as I would have liked but I had no where else to put the pump and it is my first build anyway ( The messiness around the pump is hidden by the side window anyway 
) a - 
I had actually bought some tube clamps but turned out they were the wrong size. Instead I am just using some of those industrial standard cable ties used in plumbing.