Noctua's NF-A12x25 G2 is our pick for the best PC fan for good reason. It delivers great airflow, no matter what RPM you run it at, and it's quiet to boot. If the only thing stopping you from picking some up until now was its love-it-or-hate-it colourway, I've got good news for you.
On the Noctua site right now, you can spot the 'Chromax Black' model in one or two PWM models, though you have to get the beige/brown color if you want the low-speed LS-PWM model.
