@nwarner,
As far as I know, the letter "u" did not come into use in Latin until the late
Middle Ages. However, just about any written Latin you see uses it instead of
the latter "v" in cases like those in your phrase. Æ did not come into common
use until the Middle Ages and even then "ae" was often substituted for it.
So if you want a more classical "look", use "V" and "AE" and use all capital
letters.