@dlowman There is a standard used in balanced line applications which is AES48. If the balanced line equipment supports AES48 you'll find that the interconnect cables make little or no difference in your system and you'll also have immunity to ground loops.
Do you need a phono section? Phono cartridges are balanced sources so you have have the same cable immunity at the input of the system where it matters the most. There are tube preamps with balanced phono sections that support AES48.