As someone that was int the same predicament I bought a Rode video mic cause they were both 150$ and the audio is more important true, but there are many other ways even cheaper to get the same look or effect. First most video editing systems will allow you to change lighting kinda, for instance for one of my tests I had a yellow tint like in my profile picture, but after one click in final cut pro x I cam out a crisp white as if full LED set or natural lighting, I also invested in 22$ worth of LED light bulbs that have a soft white tint to help with he effect, lastly I believe you should invest in a lightbox kit or even a LED light that are found on amazon and other places, the point is you don't need a 150$ diva light ring to get that crisp halo glow on your videos. Sorry for if some of this doesn't make sense when I listen to music my mind gets things confused.
Good Luck.