What should my first high end makeup product be?

So i really want to buy some more high end beauty products, like Too Faced, Urban Decay, Benefit, and MAC, but i'm not sure what to buy, since i haven't really purchased any of their items before. I have a Too Faced Natural Eye Palette and the Benefit Georgia Peach Box Powder, but that's it! I obviously have more makeup products, a lot actually, that are from the drugstore but i want more! I really want the Urban Decay Primer Potion, but is it worth it? What would recommend from MAC, Urban Decay, Benefit and Too Faced? Please help me :)