I think the most important thing to take into consideration with frags from Diptyque is that a good majority of them are quite linear, which is not necessarily a bad thing.
I've sampled a good handful of them and own several bottles but the ones that I probably plan to keep on hand for years to come are:
-Eau de Lierre- An ivy scent, and quite possibly my HG of green scents. Despite complaints about longevity, I find that this one (on me) lasts for hours and hours.
-Philosykos- A soft, almost milky fig. This is one you really need to try on and wear around. Smelling it on paper will not do it justice. The downside with this one for me is that it has some longevity issues, however, if you put on some of the Philosykos lotion before spraying, you'll get a little bit more out of it.
Out of their eau de colognes, I'll go for the Neroli. It's a bit floral but still brings to mind classic EDCs. Oddly enough, the Neroli behaves almost like one of their EDTs for me -- I find hints of it almost 6 hours after application.
Coming in early September from Diptyque is Eau Duelle. http://www.luckyscent.com/shop/secti...gn=FallPreview
I have a feeling I'll be into it.