@jmarshak
If you are looking for balanced line you might inquire with the manufacturers of the preamps on your list if the product supports the balanced line standard, otherwise known as AES48 (Audio Engineering Society file 48).
If the preamp does a side benefit will be that the interconnect cable between the preamp and amp won't play a role in the system sound and you will be able to run it some very long distances if needed.
If you are looking for balanced line you might inquire with the manufacturers of the preamps on your list if the product supports the balanced line standard, otherwise known as AES48 (Audio Engineering Society file 48).
If the preamp does a side benefit will be that the interconnect cable between the preamp and amp won't play a role in the system sound and you will be able to run it some very long distances if needed.