Filco quality isn't really particularly special. It's not very much better than a QFR, and for sometimes twice the price. But about Model Fs, they're actually not very loud, less loud than a Blue even. There's a refined, and rather quiet spring sound. Definitely is overly large and the layout isn't good, though.
My recommendation would be a Leopold (like you have, they're very professional looking with excellent keycaps), QFR/TK, depending on if you'd like numpad functionality, or perhaps an FC660C/Type Heaven if you're looking for a budget Topre board. In my opinion, the FC660C is much better (PBT keycaps and an excellent, compared to the crap Type Heaven, case), if you can get used to the form factor.