I recently went with a mini-itx BayTrail-D solution as my BTSync / Plex server - a breath of fresh air after year of fighting with ARM board in the same role. This would have been even better, as it would allow me to maintain the same form factor, instead of making way for comparatively bulky mITX case.
The only thing I'd like to know is how would you power a SATA drive attached to this?