I love Wolfgang, Amadeus, Sebastian, Lucian (the 3 syllable pronunciation), and Aleksander. I have most of them as middles, and Wolfgang as a first :). Devereux, and Edward are okay, but I'm not a huge fan of Balthazar. I prefer August to Augustus, because I feel like the 'gus' sound is more prominent with Augustus, and I really don't like Gus.
From your list, I love:
They are strong male names that will definitely stand out.
A few of them will have pronunciation issues, if that bothers you.
Lucian is confusing to me, while Edward and Augustus are ordinary in my opinion.
Balthazar and Amadeus are favorites for me.