So if I was going to get a dac to pair with the Jot and my budget is around $600, are there other recommendations besides the biggy?
Chord Mojo would be where I would start at $600. Though if you do not need the Jot's power, you may just decide that the Mojo alone is sufficient.
What's a "Biggy"
The Mojo is is bout $450 new from Amazon UK, which is a great deal. I spoke to about the concern about keeping the MoJo plugged in all the time and the effect that might have on the battery, and they said not to be concerned. Given that, the Mojo is a pretty good desktop DAC for $450, and can be taken portable with easy, so you get two devices in one.