We don't know what the speaker system is but I'll offer some thoughts, FWIW. The MRs are very nice to my ears. The lesser Claritys seem to be not much different in sound to Sonicaps. So if you can afford the MR, go for it.
Actually, the 2% Solens are pretty good but no where near the MR and other caps.
Some of your values are rather large and I'm guessing at xover points around 100, 500, and 4K? If possible, you may want to think about an active line level solution for the 100Hz pole. Anyway, your best bet for improvement while keeping the cost low is to by-pass larger value caps with smaller value, high-dollar caps. Some folks don't like the sound with by-pass caps so as usual you just have to try for yourself.
Good luck and have fun. Let us know how things turn out.