I only ever seem to buy Silk Naturals and She Space these days. Not sure if that's better or worse for my wallet, as I have so much of both, but at least it's cut down on the sampling (which was adding up - international shipping is not cheap).
Foundation: Silk Naturals
Finishing Powders: Silk Naturals and sometimes She Space
Glows: SN
Eye shadows: Both! (and some from MAD)
Bronzer: The new SN one for pale girls - Beach Bunny
Blush: Slight edge to SN because of the new ones in MOAC, but I have lots of both
Lippies: SN, by far
Eyeliner: SN again, with the new cream ones
Mascara: SN
The SN blush brush is a must-have, and will end up costing me more in the long run because I can wear so many more colours with it.
I just hope neither of them go out of business, but aside from foundation, mascara, and finishing powders, I think I have enough MMU to last several lifetimes - or at least til the next new collection comes out