I don't have any suggestions but I say be careful not to buy dupes (I am so gulity of this).
Ex -Plum Dressing and Nocturnelle
-Fig 1 and Graphology
There ARE variations in the tones/colors but not by much IMHO!
This site is extremely helpful with combination suggestions:
MAC Eyeshadow Combinations - Updated 08/19/08
Ex - Here are a few suggestions recommended for Expensive Pink (I like this E/S) among many:
Expensive Pink w/ Sumptuous Olive in the crease.
Expensive Pink w/ Star Violet & Beauty Marked.
Expensive Pink w/ Amber Lights or Woodwinked.
Relaxing w/Sumptuous Olive, Expensive Pink & Sable.
Sketch & Beauty Marked both go nicely w/ Gorgeous Gold, Trax, Vex, Expensive Pink & Nocturnelle.