I was never satisfied with my drybrushing results. When I take a look at the results other people achieved I was disappointed with my missing skills. Those days, I was using old synthetic bushes. Then I tried the GW drybrushing brush. That one worked for me. A bit expensive, but it does what it should do. But I am using drybrushing mostly on furs, chainmail and bases.
Are you sure, that "drybrushing style of paintig" is the right way ? For gaming minis that's okay (although I prefer heavy washing).
For display miniatures, it just does not look right.
cheers, Egrimm