Hello Mariaan
I am currently using MAC brushes in my kit and find them to be a joy to use. I have used other brands before, but these have not let me down yet. What I would recommend is that you invest in extra sponges for foundation and disposable applicators as these are the only things I have had to use as added extras. Otherwise Bobbi Brown, INGLOT and Smashbox are also great brands to try, depending on what you would like to spend.