Considering replacing my Harbor Freight DA. Options/opinions?

So when I first started detailing, I was just trying to make my own personal car look a lot better, but now I've started detailing for other people on the side. My HF DA still works great, but after talking to a few people around here, I'm considering getting something else to replace it. For one, the HF DA is loud. I'm almost worried that I'm pissing off my neighbors while using in my garage loud. I've also heard that most other DAs are a lot more stable and easier to control. I'm interested in hearing from people who have upgraded from the HF to something else, and why. In addition, I'm trying to figure out what my best option is if I do indeed replace it. I'd probably be looking in the low hundreds, so maybe something like a 7424xp or a Griot's Garage 6". Thanks to everyone in advance.