I use MAC's Select Sheer Pressed Powder in NW15 for years and I like it.
About two years ago I discovered loose powder for me and started to buy lots different brands but found with the Transluscent Powder of Essence's 50's Girls Reloaded LE something great for me (and I loooove the scent).
I've a wishlist what I want to try the next time. My favourites are beginning to find their end - and my spleen is just to re-buy stuff I love - and this pertains just to the MAC powder - means I need a another loose powder with the potential of earning my love. So I'm thinking of the Select Sheer/ Loose one and of the Poudre Universelle Libre by Chanel - I guess my wallet will decide this for me ;).