Any of the current Roku models should be fine. If you need/want one with a wired network connection, the Ultra is your only option. Because I don't recommend the Express, I'd say any Premiere or Ultra version, as well as the Streaming Stick+. I wouldn't go any older than a 6th generation device, as described on this wiki page. And again, not any version of the Express.
Dan
Roku Community Streaming Expert
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