I ended up buying Smashbox's Halo Hydrating Perfecting Powder, which is $59 at Sephora. I know it's expensive, but it's really big, so I think it will last a long time, and I really love the color and coverage. It's very sheer, so if you're looking for heavy coverage this isn't for you (although if you keep layering it on you can get heavier coverage). It is so lightweight, but it makes your skin look glowy and pretty. It claims to be anti-aging--I'm not sure about that, I haven't really noticed a big difference. But it is very hydrating and won't dry out your skin like a lot of powders. Wear it with a foundation primer for the longest wear.
And the packaging is so ingenious. You just turn the base and shave off the amount you want--no mess!
It comes with a little brush, but I ended up buying this amazing brush as well ($52 at Smashbox.com). I know it's super expensive so it's definitely a splurge, but I have to tell you I LOVE this brush, it is so soft and delivers perfect coverage and I'll have it for a long time.
If you like the packaging of the makeup but the Smashbox version is too expensive for you, Elizabeth Arden has a mineral makeup in the same type of container for $37.50. I haven't tried it so I can't vouch for the makeup, but may be worth checking out.