I want the fastest NAS setup possible...

[bbrip]

For me on the NAS capacity, speed and reliablity (and cost) are the key factors. Noise is not such an issue as the NAS stands well separated from any Listening equipment anyway. You get plenty speed withva good HDD. SSD will not add anything anyway, as Network speed is the limiting factor here. And in terms of robustness, capacity and reliability, the HDD setup on a NAS is unbeatable - and will probably remian so until 2TB SSD will be around at reasonable prices

A bit different on a notebook, where the SSD adds substantial advantages in terms of speed and silence. Always keeping a good backup is essential anyway, whether SSD or HDD