I'm impressed with Cover Girl's Fresh Complexion powder foundation - it goes on sheer yet provides decent coverage and makes your skin look so soft! It takes a bit longer to apply than liquid foundations do, but it's better for acne-brone skin than the liquids which often contain oil or silicon. This powder foundation works great for those with normal to oily skin.
I do have a few complaints though. First, it makes any dry patches or flakes on your skin stick out like a desert. Second, if you have very oily skin the powder tends to pool up in the oil after a while. I felt like I was dripping after 6 hours. Third, the color goes on quite dark - what you see is literally what you get! Fourth, the look is very powdery at first, but if you have any oil the powdered look will quickly go away.
Overall this is a good drugstore powder foundation for cheap ($6.98). Not the best one, but still very good.