I am sorry it took me so long to get to these comparisons. The first one is the one you asked for most. Two beautiful colors from the spring 2011 collections - China Glaze Below Deck (BD) and Misa Coffee Pick me Up (CPMU). When I had these on the nail I couldn´t tell the difference and thought I would write you here that they are dupes. But looking at the pictures you can see a very slight difference. Misa is slightly more grey. I don´t think you need both of these because they are soooo close, so you just decide on which brand you like more :)
P.S. I already made a comparison of China Glaze Below Deck here.