I like the idea of upgrading to a dac with both balanced and rca outs. That would be a decent option down the road. Then I wouldn't have to use up tube lifespan on my integrated amp.
I did think about just diy installing a headphone jack in my integrated, but haven't mustered the motivation to tear it apart again. From what I can tell they're a pretty easy circuit to work into an existing unit. As it sits I already need an 8' headphone cable anyways, so what would another 2-3 feet bother me.
As of right now, my headphone listening is primarily for when my wife falls asleep early and I'm wanting to listen to music later into the night. Given any choice I enjoy speakers more, but that may change with time. Thanks for your input guys!