Here are a couple more MAC dupes:
If you have Cranberry, you don't need Sweet Chestnut (and Vice versa).
If you have Next to Nothing, you don't need Shroom...
If you have Sharp, you don't need Bitter (I think that's been said already)...
If you have Dark Edge, you do'nt need Mystery or Brun...
If you have Tempting, you don't need Buckwheat...
If you have Deep Truth you don't need Contrast (or Blue Flame)...
If you have Yogurt, you don't need Lightfall...
If you have Smudged Violet, you don't need Shale...
If you have Signed, Sealed you don't need Shadowy Lady...
**These colors are VERY similar on me, but of course they won't look the same on everyone**