Well i got some good brushes, but my mind tells me to buy more always nice with a new brush.
I like synthetic brushes because is little hard and good for detail.
The enamels humbrol i suggest dont buy them or similar product, your not supposed to pick up paint with a brush but you do it anny way. After a short while the enamels dry up, you think! This is not so hard you force your finest brush through the dried paint. the brush isn't so nice anymore.