Hey! I just always use the big brush from this real techniques set http://www.amazon.com/gp/aw/d/B004TSFBNK/ref=mp_s_a_1_1?qid=1442082133&sr=8-1&rps=1&keywords=Real+Techniques&dpPl=1&dpID=41uB9e49DfL&ref=plSrch&pi=SY200_QL40

Honestly really any blush brush should do though! The powder is very bendable and forgiving in my opinion! :)

I would choose one of these two makeup brush sets. I honestly can't choose which one I need more so if you choose me...you pick! I am pretty into makeup but the brushes I have are falling apart and gross because they are cheap and old...one brush I was using on my entire face developed a strange smell and I coincidentally started having bad breakouts around that time. I realized I need to be more careful about the things I am putting on my face!