Da Vinci pocket brushes.
I have sizes 1 and 2 and do everything with the 2 now (no drybrushing obviously).
The points are that good I can do finelining and eyes with the 2. The 1 is left for very fine stuff now.
The fibre size is the beauty of them, being able to hold a decent amount of paint while still having a great point.
I get the size 1 and 2 for around £6.50 each.
I abuse my brushes like nothing else and they are still going strong after 6 months at least.
@MADMAX I had the same thing with W+N ,even the ones in store were rough and the one I got that looked good broke up after a day.
The Da Vinci are the same price as the W+N here so Im sticking with what I know now.
A note on the bristle size.
While the Da Vinci does have a larger tip I wouldn't call it a liner in the sense that it has a long fine tip that will offer no resistance.
Generic liner.
Da Vinci
I would invest in a 2 first (best all rounder.I have found the 1 more suited to fine work and freehand where the 2 is good for blending and also is fine enough pointed for eyes etc.) And then some cheapies for rough stuff.