Juan,
The cheaper brush you're referring to might be the Robert Simmons "Sienna" series.... They've got a good deal on a set through Jerry's Artarama, ten brushes various shapes and sizes for around $35.00.
Anyway, I definitely use bristles in the underlayers, where there's a lot of loose, scrubbing going on, and the WN Monarchs are great detail brushes because they hold enough paint....
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