I saw your addition to your baby name post earlier - and I wanted to change my vote : )
I think using your DH's name far outweighs the others. I think Alexander sounds better when you just look at them as random names...but now knowing the whole story - I think you should do Christopher!
We love that Evan's middle name is after my dad. It's sorta matchy with his first - and I'm sure there are some others that would have sounded better overall. But we are so happy that he has an original name and a hand-me-down name : )