Canon Eos 1000d with 50mm f1.8 lens.
Having spent several years just using my phone camera I decided the one thing I really missed was shallow depth of field pictures of my walking companions (my wife and children). The phone covers most wide-angle landscape shots quite well (and, with a little HDR, sometimes better than my SLR), so I don't need the kit 17-55mm lens. And telephoto shots are nice, but moderate telephoto shots can be simulated by cropping something taken with the 50mm, and I can forgo the use of anything longer, which really does get quite heavy. So that's the right level of compromise for me, and means I come home with some significantly different pictures from those i can take with just my phone, for just a little over a 500g weight penalty.
An example, coming off Great Gable, with Styhead Tarn in the background, the week before last. Still impossible to take that shot with a phone, good though phone cameras are these days.