Golpari Beauty makes the best gold eyeshadow on the planet, however; because it is made from real gold, it is a bit pricy.
I really love Chanel's new gold collection for Fall of 2008. It is gold and the shade is very beautiful. The quad eyeshadow palette is amazing and looks to have an amazing gold shadow in it.
I think my favorite gold eyeshadow by MAC is Gorgeous Gold or Goldmine. Gorgeous Gold has that champagne gold kind of color that I truly love. Goldmine is a beautiful striking gold. They are both very versatile and just beautiful. I also love (and recommend) Urban Decay's half baked, as well as, Hard Candy's Buttered Popcorn.
I have a friend who uses her Girlactik Face Glimmer in 14k as an eyeshadow base. It is a beautiful gold. If you are looking for something like MAC's paintpot, I would recommend Bloom Eye Paint in Champagne.
The best affordable gold eyeshadows would be: Golden Pearl or 24 karet by NYX, Golden Glow by E.L.F., Golden by L.A. Colors, and Antiqued Gold by Milani.