Seagate's NAS Pro family has features and performance that are worth checking out.
Synology has added to its line of expandable NASes.
Synology's DS415play is a high performance four-bay Evansport-based NAS.
Synology has announced a four-bay media-focused NAS.
ASUSTOR's AS-30XT two and four-bay NASes have a good combination of price and performance.
ASUSTOR has announced a lower-cost rackmount NAS.
Updated: ASUSTOR's AS-20XTE two and four-bay NASes have lower cost, but also lower performance.
ioSafe has announced a hardened expandable five-bay NAS.
LenovoEMC rolled out more powerful four-bay small-biz desktop and rackmount NASes at CES 2014.