Yeah that Logitech would do (either of them, really). A bit more features than I recall (your first link), but it would do what you want. The Sony product, "HTS-360" sounds right; could be wrong.
Regarding the other option - that AudioEngine device would work; you don't need digital decoding at that point (it's stereo only, the players can downmix for that). A "really good" subwoofer can cost over a thousand dollars, and two speakers can get expensive as well (you need more constraints, basically). The AudioEngine is an integrated amplifier, has a volume control, just add a toggle switch for the various inputs (they're cheap, few dollars at most). You'll run the sub off of the amplifier terminals, and you'll drop the LFE track from DVD/Blu-ray/etc content (which probably isn't the end of the world). I'm not sure how this would be "better off" - but if that's what you want, it would work too.
If you want a compact stereo amplifier, a T-Amp may be a suitable choice. Dayton Audio makes a decent looking model, "DTA-100" - looks smaller than the AudioEngine, maybe a hair more power (honestly though, and I'm assuming this is nearfield, 20-30wpc is more than you "need").
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