L'Heure Bleue is just gorgeous and there is nothing else like it on the market, but I've noticed a tendency for it to turn a bit oniony (????? yep) in the very, very later stages. I wish I had a better word for this, but I do not. The same occurs with Bois des Iles. The heart notes seem to crystallize on top of the base and become sharp and perhaps pungent. I still wear it, but by the next day there is a decided vegetal quality to it. Obviously this is a factor of skin chemistry since I have never heard anyone else remark on it.
If you decide on Shalimar, try to find vintage, or at least not recent. I've noticed a softening in the newer EdP, as if the leather notes are dumbed down and the top isn't quite as crisp with bergamot as it once was. It's still a unique and classic scent. I find it more powdery and mellower than L'Heure Bleue, and also more nocturnal and opulent, whereas L'Heure can easily be a daytime scent.