Hi Naugrim,
You are welcome. How about that one from Doepfer, the A-130? It's reasonably priced and if you build up enough experience with it and you want a more fancy one you can consider that for the future.
With logic modules I meant logic functions like: AND, OR, NAND, NOR, XOR, etcetera. You don't straight away have to buy it but keep it in mind. Once you have build up experience with your rack then you might want to look into it to play around with CVs and make it more exciting. I am myself rather new on that field as well and still have to do quite some homework in that area before I would be able to give you better advice than this.
Make Noise Maths goes into that direction but is not a "pure" logic module on its own; Maths is just a wonder on its own :-) Marbles I don't know it well enough but I don't think it's a logic module as such.
Generally I would recommend to not fully plan the second row yet, keep some blank space left, you will need it in the future to adjust the ideas (and experience) you have now. So in the future you can add a few modules without having the issue of straight away need to buy a new case...
Good luck and kind regards, Garfield.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads