The PI 2 is a fairly powerful little computer. It's only real downfall is that it doesn't have a SATA interface but other than that
I know this is over a year old, but I just came across it. There are lots of add-on boards for the Raspberry Pi. including this one that provides a SATA port:
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LoginIt also provides WiFi (redundant with the Pi 3, except it boasts an external antenna for greater reach), SPDIF, Audio inputs, an IR interface, a Real time Clock, Bluetooth, 3 additional USB ports, and flexible power inputs (6 - 21V) on a coaxial connector.