I haven't posted in this thread in ages, but Dan's back, so...
I am half-way back from Colonia. I flew my DBX out there, partly to hunt untagged systems and partly to pin the four engineers around Colonia, which was done. The trip has been very successful. So far, I've found around 3,000 first discoveries, including 8 ELWs, 6 AWs, 60 WWs and over 1000 HMCs. Data is closing in on 500 mil. I didn't do it for money, but it's a nice bonus. It's amazing to me how much is still undiscovered, and not too far away. First untagged system was found 999 light years out.
Prior to this my farthest from start was 5,077 light years to unlock Palin a couple years ago. So this trip was way longer than anything I had done, and I've really enjoyed it. Very glad to have done it. Might not be back for a while though