The Canon EOS 70D is a great update of Canon's enthusiast-level DSLR. With its sound design and build, sleek swivel touchscreen and first-rate handling, it's more than just a simple mix of the 60D and 7D. The innovative Dual Pixel AF system makes the autofocus fast and smooth when working in Live View mode or video mode, successfully improving on a long-standing problem seen in all DSLRs.
Best of the rest
Canon EOS 6D
The 6D is Canon's first more affordable take on the full-frame DSLR, with a 20-Megapixel 24 x 36 mm sensor! This is also the first SLR to sport a Wi-Fi chip for controlling the camera remotely or sharing pictures. The autofocus works very well in low light and the 6D shoots at 4 fps in burst mode. It's a shame that there's no swivel screen or touch-controls, and that Canon has left out the built-in flash. Still, the 6D performs well in both photo and video modes (although the AF can be frustrating in video mode).
Canon EOS 700D
A well-balanced SLR in both photo and video modes, the 700D is a great option for former beginners who are looking to progress. It boasts a swivel LCD with touchscreen controls, speedy continuous shooting for sports photography and a decently sized viewfinder for a camera at this price point. Picture quality is good and STM lenses (including the 18-55 mm kit lens) keep focusing nice and smooth in video mode. All that's missing is Wi-Fi for a quick and easy way to share shots.
The D3100 is an entry-level SLR with picture and video quality worthy of a higher-end model. The camera body is, however, quite basic, and the optical viewfinder is a bit tight. Note that some second-hand lenses won't work with the autofocus.
With its all-weather finish, 100% viewfinder and pair of settings wheels, the K-30 has loads of features you'd expect to see in a more expensive higher-end model.
Sony Alpha 58
Sony's A58 SLT is packed with functions, including an 8 fps burst mode with autofocus, sweep panorama, and a fast autofocus in video mode. Still, you'll have to make do with an electronic viewfinder rather than a proper optical viewfinder.