Katowice does filtering but I don't think it is what you want for a case this small; it is a bit more specialized. Watch some demos of it and Ikarie and you will see the difference. How do you plan to sequence pitch? Pam's is somewhat limited in this respect. What other equipment do you plan to use (at a minimum, to listen to it)?
If you haven't bought any of this yet, I suggest that you write up the goals of your system, and go through the various categories of modules, asking yourself whether you need one in each category (or why you don't). You will probably come up with a final list of choices that is larger than this case. You might be tempted to get very small modules to squeeze them all in, but that may not be a good idea. Instead, consider a larger case.