Go to www.ava-luxe.com - there's a stack of them there. My favourites are Rasa, Love's Tru Bluish Light and Madame X (Rasa Xtreme is a little faecal for my nose due to the civet but some love it). She sells samples so go knock yourself out.
I also love Frederick Malle Musc Ravageur, Caron Tabac Blond (fairly subtle dry down on me but very sniffable). If you can get hold of Serge Lutens Muscs Koublai Khan, that's really quite a stinky musk, but in a good way...but it's only available from the Paris salon and for mail order in Europe. Some basenoters might be able to supply you with a decant or sample though.
Miller Harris L'Air de Rien has a musky amber dry down too...very nice.
A lot recommend Kiehls Musk oil, though I've not tried it.