I decided to get back into photography as a hobby earlier this year. I've not been heavily into cameras for personal use for about 10 years, just been pointing and shooting with consumer Sony gear, but have been using Canon still (EOS 50D/60D) and video cameras (XH A1) at work for the last three years or so, not full time but standing in for our normal photo/videographers when needed.
So cue a load of research - online, forums, magazines etc. And a lot of visits to camera shops to compare handling etc etc. All of which is a good idea IMO when you are going to commit this sort of money.
Now I don't have the degree of experience that some do (at best I'm an enthusiastic amateur) but I do know that I wanted a camera that was going to last me for years, had reasonable aftermarket support, would stand up to some abuse and of course would take quality pictures with a full range of manual controls as well as sensible automated intervention when I want it.
The no-brainer choice for me would have been a Canon 60D, which is what I've had access to over the last few years. But the outcome for me was that I purchased a Pentax K-5. Every shop I went into was trying to sell me either Nikon or Canon but the Pentax won me over for a variety of reasons, not least of which was that it handled really well IMO. It's true that Nikon and Canon have a lot of support, and rightly so - they are great pieces of kit - but the K-5 just ticked so many boxes for me. Used it loads since I bought it and have never once regretted the choice.