Ahh, that is a nice preamp. I would wait and get the preamp first before making any decisions.
I would be tempted to take any other source, DVD player, Ipod, whatever and listen to both that and the Jolida via the Herron to get a better feel for the warmth imparted by the Herron vs. the source/Jolida. This may help you make a better decision if you do decide to replace the Jolida - whether you will seek more warm or more resolution in your next player/DAC.
The Herron definitely outclasses the Jolida in my mind, but I don't know their CDPs as well as their amps.
I would be tempted to take any other source, DVD player, Ipod, whatever and listen to both that and the Jolida via the Herron to get a better feel for the warmth imparted by the Herron vs. the source/Jolida. This may help you make a better decision if you do decide to replace the Jolida - whether you will seek more warm or more resolution in your next player/DAC.
The Herron definitely outclasses the Jolida in my mind, but I don't know their CDPs as well as their amps.