Warning: I am about to be an asshole.
You should not be concerned about the color scheme of your setup, and even more importantly you should be extremely wary of anything marketed with the word "gaming" attached to it. In the market right now "gaming" is code for "we added some angles, made it red, and threw some LEDs on it so we can double the price".
If you want immersive sound for not too much money I would suggest picking up a pair of IEMs from a reputable brand. Just google best IEMs under $50. You'll find something good.
As for chairs, finding decent furniture at that price is crazy difficult. I have already had two bad experiences at about that price range. The best cheap chair I have owned was a little IKEA office chair for ~$65, and that will at least hold up better than the cheap Chinese gaming chairs on amazon. I would suggest going to a store and trying some out though, because a comfortable chair is a necessity.