It depends on what feel you have in mind.
Richard, which I'm neutral about, feels "nice uncle or neighbour" to me, and is very timeless.
Christopher, which I love (especially with the nickname
Kit) which is more "your best friend, who is much more popular than you, but who is kind to everyone, who you attend either a posh all-male school OR Oxbridge, OR one of the
Ivy League schools with between the years 1870 and 1970 who dies either of a) consumption b) drowning c) Mysterious Circumstances. But that's just me.