I just got the Erica Polivoks VCF II and can’t believe how great it is. It’s a fairly straightforward filter, but I’ve had so much fun with it already. With filters, the old adage “use your ears” really applies, and the Polivoks sounds perfect to my ears. It sits somewhere between an acidic Roland-ish sound and the MS20. It doesn’t have a crazy feature set or anything (like the QPAS, Dipole, Morgasmatron, or Filter 8), just a great sound and can be found for $200 or less.
The Doepfer SEM and Morgasmatron (or Dual Borg) are still on my shopping list, but I’m pretty happy with what I have for a while.