It was really hard to narrow it down to just four names! In the end I chose Caspian, Cedric, Balthazar, and Lysander, but I also really like Phinnaeus, Crispin (and Pip is a cute nickname), and Arthur. I really like Caspian on its own, Caspar just seems like a whole other name altogether, especially as it's not that much shorter than Caspian anyway. Great list! :)
I like Balthazar but prefer Baz to Zar. I cut it from my top four because Zar sounds really Czar-ish to me.
I like Phineas but I think I prefer this spelling. I can't find too much grounding for the Phinnaeus spelling outside of Julia Roberts using it? Willing to be corrected though. It still made it to my top four because I like Phineas (and unrelated Finnian) *that* much.