The problem with providing balanced inputs is that this requires either a matching transformer or an additional active circuit at the input of the amplifier and neither of these will do anything good for the music signal.
The only honest way to do balanced line performance is to build each piece of equipment in the audio chain with four discrete audio channels, plus left, minus left, plus right, and minus right, combining the signal at the speakers. This will slightly reduce noise pickup if the equipment is used in an electrically noisy environment such as a live stage or mixing studio chock fulla electronics and cables. This issue does not apply in a normal home audio system. Of course doing balanced line the right way requires double the number of active channels as with a normal two channel system and thus essentially doubles the cost for no useful purpose in a home system. Doing it the quick and dirty way with two channel internal circuits and combining and separating out four separate channels to use those nifty cannon connections is worse then useless as the extra circuits just add distortion.
"Balanced line" is just more audiophlake foo-foo dust in most cases and always increases the cost.
You may think it sounds better, but actually since balanced line operation adds 6dB to the sound level, it will, all things being equal, sound louder, and everyone knows louder is better.
If your object is an awesome two channel music experience, then just go for great two channel equipment, not useless add ons.
Frank Van Alstine