My brush size's range froma a 10-0 up to a size 6. When i used to paint those i would use a 5-0.
I have 12 sizes in all, one set for acrylics and one for enamels. I go for the better quality ones at a local art supply store. Not cheap, but deffinetly worth it.
I am a Norfolk man and i glory in being so
On the bench: Airfix 1/72nd Harrier GR.3/Fujimi 1/72nd Ju 87D-3