I love the beauty blender, it’s a great personal investment. I wouldn’t suggest it for a makeup kit. Not really that hygienic to use wet sponges on a series of different people but great for one person. Love blending my creme foundations with it.
I get a mix of brushes from different lines. I suggest mixing and matching based on what works for you and your makeup. I like the Nars Yachiyo Blush Brush alot because of it’s versatility. You can use it to blush or contour your cheeks. I sometimes use it to set my face with powder.It’s just a great brush for powders in general.
Outside of those 2 tools, I say look around and try different brushes. I have brushes from Ben Nye, MAC, Aveda, Prescriptives, Smashbox, NARS, etc. MAC is a good place to start because you have a wide range of options and choices between synthetic and natural fibers.