mikeb wrote:How silent it can be with exposed fans?
Cases can help dampen some, but in my experience is not that much, its more about choosing quiet components, for example GPUs like GTX750Ti from MSI and Asus are very quiet, there are even fully passive like the Palit that you could have both slim case fan on it, grab a good motherboard with good fan control like an Asus, i prefer MSI but you need to understand how each header works. Either way, i wouldn't fear an exposed fan, fans with less restrictions often can move more air and thus not needing to ramp them up as much, so it could be beneficial, now if you plan to run it into audible levels, the exposed fans will be more noticeable than on a dampened restricted case.
As long as the components inside don't need more cooling than what you can give with the fans dropped to inaudible levels you will be fine. Now if you place a GTX980Ti there and you stress it, it will be noticeable, probably even loud, the trick on building a quiet pc is choosing the right components so you end up with a quiet pc, regardless of the case.
mikeb wrote:And would an m.2 SSD like the new Samsung 950 Pro mounted on back of the motherboard cooled sufficiently?
The 950pro m.2 are not out yet, so there is no way to tell if you if it will need some airflow or not, i seen some m.2 ssds that even on the top of the motherboards they do overheat, but i also seen some that work fine. On laptops, they dont have direct cooling and they work with very little airflow, so my guess is that it might be fine below the motherboard.... but then again.. its not out, so who knows.
From what i can see on the case, it allows for 2x 2.5 drives, at least from what i can tell, i would buy a crucial mx200/bx100 + a Samsung/Seagate M9T or Hitachi 5k1500. I cant feel any difference between my Intel X25M and my Samsung 840Pro, what you get with ssds and what we all love its their 0 latency, their quick response to any action, and that will be given by any ssd, no matter the interface, you will get much higher sequentials on newer ssds and m.2 and sata express, but to me, it feels the same in real life, you just spending more for having higher sequentials, unless you need it, i feel money can be spent better in other components.