I'm looking at getting one of these for my folks Christmas to turn their standard TV into a smart TV as they don't subscribe to Sky, Virgin Media etc. Essentially me and my brother have settled on Android as they both have a google mail email account and we don't want to go down the Apple route. This also avoids having to subscribe to Now TV or the likes.
Must have features are: Wifi, Ethernet connection, USB (In case they want to connect a keyboard).
Are there any particular models that fellow H&SFB-ers can recommend, or ones to avoid. Needless to say the electronics store I went into, in order to find out about these gadgets, the salesman knew less about these things than I do (which I didn't think was possible!!) Deep Joy.
Any guidance gratefully received.

You are only a millimetre or a millisecond away from the next incident.