If you are looking to pay more than £1000 for your camera you are shopping at the professional end of the market. Cameras in this price bracket offer you ultimate control over your photos with a full range of creativity controls.
Improvements over cheaper cameras include better build quality, faster operation and better focusing control. You are also likely to find improved performance in lowlight situations. Another area where you can find better options is when it comes to shooting movies.
If this is your total budget and you do not already have some good quality lens it may be worthwhile considering dividing your budget between a cheaper camera body and a good quality lens or two. This is because the quality of the lens plays a major part in the quality of the photos you take and you are unlikely to get the most out of an expensive camera body if you couple it with cheap lens options.
The EOS 60Da is aimed at people with an interest in astrophotography. This is because it is more sensitive to infrared light than a typical DSLR. High speed shooting is catered for by a 5.3 frames per second burst mode. For focusing there is a 9 point autofocus system. All 9 points are cross type sensors. Canon have also included an electronic spirit level. Images can be stored in RAW as well as Jpeg. The use of 63 separate metering zones helps to ensure correct exposure.
The Canon EOS 5D Mark III is one of the most advanced Digital SLRs. It offers 61 point Auto Focus, the ability to shoot at up to 6 frames per second and has a 3.2 inch LCD screen. Shooting movies is taken care of by a Full High Definition movie mode, stereo sound and the ability to use manual exposure while recording. There is a socket for an external microphone and one for headphones. Canon have equipped the camera with weather sealing. The body is built around a magnesium chassis.
As well as having a very high number of megapixels the SLT A77 offers shooting at speeds up to 12 frames per second. It also has GPS tracking. Other features include a 3 inch LCD screen, an electronic viewfinder, image stabilisation, a depth of field preview button and a digital tele converter that can increase the magnification of your lens by up to 2x. A 19 point Auto Focus system is available and the SLT A77 is able to record Full High Definition movies.