the best sm/ powered speaker or is it better to...

use a pair of old polks m5's w/the T.V. or even bose with a good receiver ? I understand the polk might be better . the audioengine's are computer speakers but can plug into the back of my T.V. directly
but how do speakers like this sound compared to reel speakers ? ( polk ) .
I won't as best a sound for the T.V. as I can for about $100 to $175 .

Thank you all

Alex