I have had some bad experiences with the Army Painter brushes. I really like their dry brushes and the "monster" size brush, but around half of the smaller brushes ("character" size and smaller, I haven't tested the "regiment" size) I have had develop problems with keeping a point almost immediately. It's a shame, as I really like the triangular handle.
Lately I have been using Raphael 8404 brushes and they have been working very well for me. I need to get some Windsor & Newton Series 7 ones to compare them to, but for now I can recommend Raphael for anyone even semi-serious about their painting. They are expensive, but you will see where the money went when using them, especially when layering.
Some thoughts on keeping your brushes in working condition:
Clean your brush regularily while painting. Giving it a brisk shake in water should be enough. I tend to do this every time I load more paint to the brush or am preparing to change colours. Just use plenty of water, 1/2 liter works for me, though you can use less. A regular, smallish cup is not enough unless you keep changing the water constantly.
As others have said, the easiest way to get a brush to form a point is to use your mouth. I usually do this after I have cleaned the brush (and before loading it with paint...).
Thin your paints and use a wet palette. This is important for other reasons as well, but it also minimizes the amount of paint that has a chance to dry out in your brush. It is much easier to clean a brush that has been used with thinned down paints than one that has been used with paint straight from the bottle.
After painting I take a drop or two of dish washing liquid on my palm and gently twirl the brush in that. You should be able to see the remaining paint coming off the bristles. After there is no more paint, rinse your brush well.
When using brushes with natural hair, when the brush is clean, I take a drop of unscented hair conditioner and gently work that into the bristles. I shape the bristles into a sharp point, rinse away most (but not all) of the conditioner and reshape. When I start painting next time, I rinse the brush again. This keeps the bristles in a good shape and allows paint to flow more smoothly from the brush. It also seems that drying paint doesn't stick as well to a brush that has been treated this way. A good quality brush soap would probably work as well or better if you can get it where you live. You can probably skip this part if you use synthetic brushes.