Updated - Synology's DS1517+ is an attractive choice for a 10GbE capable NAS.
QNAP's TS-431X is an inexpensive way to move up to a 10 GbE NAS.
QNAP's TS-231P is a good value in a RAID 1 NAS.
Drobo's new 5N2 five bay NAS is a good option for folks who want the most flexible way to grow their NAS storage.
QNAP's TS-228 is inexpensive, but makes performance compromises to get there.
QNAP's TS-431P is an entry-level RAID 5 NAS that should satisfy cost-focused buyers.
Synology's DS416 and DS416j are both good values in four-bay RAID 5 NASes.
Promise announced a Private Cloud NAS at an affordable price at CES 2017.
QNAP announced a slew of high-end NASes and its first wireless AC router with built-in storage at CES 2017.