It's fun to go cologne-crazy sometimes isn't it?
It does get hard to pick out the nuances though when so many 'fumes are experienced in close succession. I'm intrigued by some of your comparisons though. One problem with these aggressive smell-a-thons is that they are top note heavy and you can miss very glaring differences that take time to develop. If you wear Egoiste on one side and Sandalwood on the other, or New Haarlem and Rochas Man, for a whole day, I am sure you would reconsider. Actually those combinations don't sound half bad! Although I have been as bad at making impulse buys as anyone, I urge you to give a longer tryout to fragrances, rather than buying on recommendation.