This isn't really my "preference" as it's the OEM tire and I haven't replaced it yet, but seeing as I made a post questioning the Dunlop 205s, I thought I'd contribute to this thread...
I had about 6000 km (<4000 miles) on bike before I left on a 6500+ km trip to South Dakota and Wyoming (yeah, we stumbled across the Sturgis Rally). I thought that I'd have to replace the rear during the trip, but, as many here predicted, the tire managed to hold up for the duration of the trip. I now have almost 14000 km the rear tire (it was a long trip) and I'll probably replace it this week (with a 205 only because I'm not replacing the front). Soooo, I'm happy with the mileage that I got out of that tire.
Having said that, though, when it comes time to replace BOTH tires, I will try either the Dunlop 220s, or the Macadam 100x. The reason being is that my front tire started showing noticeable cupping/scalloping as early as 6000 km.
For you guys running the 020s, what kind of mileage are you getting out of the rear? For me, I'm more interested in higher mileage than "stickyness".
Cheers.