I definitely need to get a new super fine paint brush, though.
Lee, if there's a Michael's anywhere in your area, I recommend going into the artist brush aisle and looking for brush sets made by Artist's Loft. They offer a set of four synthetic brushes (item #171138) made for acrylics, with 10/0, 5/0, 0 and 1 brushes. The set is about $5, and I think for the money it's a terrific value, considering you can pay more than that for a single brush from the premium line. I have a few of these sets, and they perform about as well as premium brushes. Highly recommended.