Conti Force & Attack for summer.
I have used the DD's and terminally ripped one of them after only about 600km. I have also used the R1s but found they puncture easily in the wet and wear quite quickly too.
Currently using Conti 4 seasons as a general training tyre which is a bit tougher than both.
I'd go with the R.1's. I know a lot of people like the GP's, but to me they are heavy for a high end tire and don't roll particularly well (all mine were almost 20 grams over claimed weight per tire) . The Ultremo's are lighter, faster, more supple and corner better. I've found the Ultremo's better at stopping things like glass, thorns, flint, and most small sharp objects, but the sidewalls are fragile and the 4000's are better at protecting against a greater variety of road hazards and are less likely to blowout. The Ultremo's also wear pretty fast, I get about 700 miles on the rear vs almost 1.5k on 4000's, and if you lock up a wheel they will shred themselves. Now if your are talking attack/force they are just as fast, if not faster and are closer in weight to a true race tire. I would run them more, but its hard to find a place that stocks the rear only for a reasonable amount of money, and I already have 2 un-used fronts since the rear wears out so much faster.
So if you ride 200miles per week the Ultremo's would last less than a month and the 4000's 7 weeks or so? That cannot be right surely.
You're doing something wrong. My rear Ultremo is virtually perfect. My front still has evidence of the centre moulding.