In agreement with what has been said so far and just wanted to drop in a note about the Joranalogue Filter 8: It's complicated.
I know this filter has been getting a lot of praise and has been placed on several "Top 10 modules" lists. I have owned one for about six months. It's a very powerful filter that craves lots of modulation to get the most out of it. If you're just starting out, I'd suggest a filter or two of simpler design. With that 12hp of space, you could have something like the new Mutable Instruments Ripples v2 or a Doepfer A-124 Wasp (classic AND cheap) plus a Steady State Fate MMF pingable VCF or even a Make Noise LxD (low pass gate). This would open the door to lots of creative sound plus a friendly learning curve.
Joranalogue Filter 8, terrific module but big for this case and complicated for someone just getting into modular/eurorack.
Just my 2 cents. :-)