Tube preference is such an individual thing. I have a DC-3, and I have tried a variety of configurations. The JJs from Bob at Eurotubes are definitely a good deal. I always used to run the amp with stock boogie tubes, and when the amp was new, they sounded just incredible.
Next I tried the EH 12ax7s, and I liked them a lot too. After that I moved on to JJs. The JJ EC83s tubes are more "smooth" to my ears - less brittle sounding. I have to push the front end more to get the same break-up with these tubes, but I do like the overall sound. More of a vintage vibe, in my opinion - think Vox on steroids.
What I am doing currently is using the EH tubes in V2 and V6, and all the others are the JJs. I like it like this - seems like a good compromise.
For power amp tubes I am currently using the JJs, but I don't hear much difference between those and the EH EL84s.
Basically if you don't want to stray too much from the original sound of the amp, try a new set of EH tubes. If you want to start playing around with your sound, move over to JJs. If you use Eurotubes, Bob's a lot of help in terms of figuring out what you'll need to get the sound you're looking for.
Hope this helps.