Doepfer A-106-5 SEM
I listened to a lot of filter demos and this one sounded really nice. I bought it and put it in my Eurorack and I love it. I use mostly the LPF but the HPF and BP sound great too. The best part other than the sound is the price. The other filters that sounded this good cost a lot more. I'm a fan of Doepfer and will continue to aquire more of their modules.