A lot of good info in this thread. My camaro is black also and after purchasing it pre-owned, it already had tons of swirls from autowashes or something. I decided to go the DIY route following instructional videos on YouTube. As KirkH said, it is very satisfying doing it yourself and seeing the results, even if it is a 60% improvement.
AmmoNYC on YouTube is fantastic to learn about black paint, among others like dallas paint correction.
This is one of the best videos for black paint. You might have already come across AMMONYC, but just in case, here is the video.
https://youtube.com/watch?v=MQ_0M81_grU
I also have spent over $200 in products in less than a year. Now i have calmed down,. After learning from different videos and the forum.