Many many sincere thanks to all who gave such wonderfully comprehensive, even educational replies and suggestions for a great citrus. I think the bottom line is...it's time to sample more before deciding on something. I'm in no rush to drop $$ on a bottle of something until I sample one that I absolutely feel passionate about. i.e. I'm in this for the long run

A couple more that peaked interest from your suggestions, other BN reviews, and Turin comments are: Eau de Rochas Homme, Monsieur Balmain, and the AdP offerings. They all seem to get very good praise and sit somewhere between natural type quality and longevity. Not to mention, my original curiosity about Eau de Guerlain is strengthened, so that'll be on the sample list as well for good comparison. Having worn the Blenheim Bouquet yesterday, it's growing on me, but not by any means a love affair yet....
Cheers to all!!