Another I need a replacement brush post...

[wulfgar1976]

I agree with @Multum in parvo about Yaqi brushes. They have such a wide variety of styles that one (or more!) will suit your purposes well. Check out the Yaqi Factory Store on AliExpress for a look at their wares.

Currently, my favourite is the Yaqi Blue Marble 26mm Timber Wolf. It has a nice beefy handle and the Timber Wolf knot has a moderate amount of backbone offset by super-soft tips. It is a mainstay in my rotation:

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I have one of those on the way as the 24mm version was an extremely pleasant surprise. It feels just like a badger brush and retains water like one.