I've been using the Antec P180b for over 4 years now
It has served me well, but after transitioning to a watercooling setup a few years ago, I've been wanting to get a smaller case.
I have an external watercooling setup for the CPU and GPU. So airflow isn't a priority. I'm looking for a case that has fan intake filters, small dimensions and hard drive dampening. Good structural integrity (case vibration) and HDD vibration dampening are probably the most important factor for me b/c the HDD vibration is probably where most of the system noise will come from. The case will need to accommodate for 2x 3.5" HDDs and 1x SSD.
After looking at the case recommendations section, I think the Fractal Define Mini fits my needs, but I wanted to see if anyone else can suggest me another case to look at as well.