Another vote for the Kinesis Tripster here. In fact, my Tripster ATR does for me exactly what you've asked for - it's my sole, do it all road bike.
I had an alloy Tripster that did me proud - bought it as my first disc road bike a few years ago for a lumpy, muddy, backroad commute, and some winter training. I sold my hardtail mountain bike within a few weeks of it landing as it also did the sort of simple off road stuff I was doing on that.
I replaced it with one of the first titanium ones last summer and stripped the carbon road bike a few months later, having barely used it. I spent Christmas working out how to make the Tripster the 'do it all' bike, and have had it on a bit of a diet. It's already got Ultegra on it but some new carbon bars and post, lightweight stem, some 'summer wheels' and tyres, take the guards off after Easter (maybe) - it'll be close on 17lbs I reckon. More than good enough as a summer bike.
It's fast, comfy, tours and commutes well, has had a couple of (uphill) Strava KOMs to its name. Yes, the drivetrain's getting shot in the winter, but I've even had it on the turbo trainer (with the summer rear wheel shod with an old tyre).
It absolutely ticks the box for me and having had five bikes in the garage at one point, I'm bloody loving having a full suss and a road bike and nowt else. [/simple life]