Maybelline Mineral Power Translucent Loose Powder is really nice. Also Rimmel Stay Matte Translucent Pressed Powder is very good too.
I use NYC Smooth Skin powder, it's inexpensive and does the job but honourable mentions to Rimmel Stay Matte Powder, It's sets my foundation without giving an ashy look to my face!
Hope I helped!
Maybelline Dream Matte Powder (: