Yeah, I don't remember what it was with Ambre Sultan--it's been a long time since I tried it--but the spices weren't quite right for me. I've never tried any of the Serge Lutens florals. I'm not sure where I'd start other than La Fille de Berlin. I would also like to try Santal Majuscule.
Santal Majuscule is on my 'to sample' list as well. I have Fleurs de Citronnier which is a lime blossom fragrance I wear only on extremely hot days mostly because of the musk in the base, which reminds me of freshly laundered linen. I know that may not sound great and some people complain about it, but I actually like it a lot in the summer.
La Fille de Berlin has a huge fan following and it's like a bunch of dark red roses, slightly jammy and deep, but I also like Sa Majeste la Rose which is an authentic rose perfume; reminds me of dewy pink roses with green leaves. It does get a bit cloying if oversprayed because of the honey note in it but applied with a light hand, it is a simply perfect rose.
A la Nuit is authentic jasmine but it gave me a headache from the sample. But lots of people love it. Fleurs d'Oranger is a very well made orange blossom perfume. It is definitely not light and airy and has cumin in it which elicits mixed feelings. I like it a lot but I have to be in the mood for it to wear it. Nevertheless, I would not part with this one.
Bas de Soie is a hyacinth and iris perfume, well-made but it is quite light compared to the other fragrances and did not last long on me. It is compared a lot of Chanel No. 19 but to me they are not that similar.
Un Lys, which I am wearing today is a lovely lily. It is actually quite a simple perfume but absolutely blooms on the skin and smells great. Unfortunately, it is available only in a bell jar. I am going to finish my sample but I have a feeling I will be adding it to my collection at some point.
My apologies for such a long post! I tend to get a bit carried away when talking about fragrances.