I'd suggest having a look at the Maesy U4C.

It runs on a RK3188 chip (1.6GHz QuaA9) - as fast as a SS3.
It runs Android 4.2.2 so it's not really outdated. It also runs Linux natively.

Decent Mali400-mp4, 1GB DDR3 RAM, 4GB NAND (must load Linux off sd). The nand was a downer, should've given a 16gb.

Has BT 4 (modern LE), Wifi abgn (as well as antenna extender).

Other handy things are USB-OTG 2.0 support, Built in Mic, Built in 2MP camera (decent enough for Skype), and extension box for more USB ports and SD slots.

Seems like the best dumbTV to smartTV converter besides using a Miracast dangle, SteamBox, or a Xbox One.