Obagi Nu-Derm or Obagi C-RX?

I'm 39 and have combination skin, problems with black and a occasional white heads, no pimples, just a few fine lines, and in recent years melasma. The brown spots on my cheeks and black heads on my nose and chin bother me the most. I already use Tretinoin and Obagi's 50 SPF daily. I'd like to try a whole line of Obagi products to see if my skin will improve. Which line would be the best to address my issues (especially black heads and melasma)? Nu Derm or the new C Rx line?

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