Are the army painter sets really even worth it? I have watched some painting tutorials and when they are done with the army painter stuff they generally don't look as good as when people mix and match colors or use citadel stuff.
There's no denying army painter is more convenient and cheaper though.
Citadel regularly declines in quality, and increases on price year after year.
There are several lines of miniature paint available:
Formula P3 (Privateer Press)
Vallejo Game Colour
Vallejo Model Colour
...and probably a few more I've forgotten. That said, it's much better to just build a set of paints yourself. Every time I buy one of these boxed pre-made sets, there's at least one colour in there I almost never use.
And it is kind of strange that CoolMiniorNot hasn't come out with their own paint line yet.