Depending on what you are shooting, you might look into your MILC options as well. The sony a6000 coming out in April looks like a beast! But that also means the nex 6 will be dropping in price soon.
I'm pretty biased towards the mirrorless category. I gave up my heavy- back breaking DSLR over a year ago and you couldn't pay me to switch back! Image quality is superb, and the small package ensures I never have ask myself "do I REALLY want to drag the camera along?" My FAVORITE feature that I could actually cry if I had to give up is focus peaking. I have terrible eye sight, even with glasses and they actually don't make a single contact lens to correct my vision. With focus peaking, the camera highlights in your chosen color (I use yellow) the areas that are in focus so you can be assured you are nailing focus every time. I also love the DMF feature where it does auto focus and then I can fine tune focus manually. When I turn the focus dial my screen changes to a 100% crop of my focus point so even my poor eyes can really tell when I have nailed focus! I don't shoot video, but they are supposed to be more than qualified for the job. The Sony's have flip screens, and also autofocus in video (I know my friends 5dmkiii does not, so I'm not sure how many do.)
The downsides to MILCs are slightly slower AF time (although the a6000 coming out claims to be faster than a dslr) and for now, fewer native lens options. However there are plenty of adapters that enable you to use ANY lens. So if you are shooting wildlife, or indoor sports, perhaps a dslr would be better for you until MILC's catch up.
Edit to add: if this is your first interchangeable lens camera then the "down sides" to mirror-less will probably not even phase you since you "don't know what you're missing" when I first got my sony, I HATEED the "slow" autofocus, but I learned to work with my camera and now i don't even notice.
One more:Just food for thought: SLR'S were invented so you could see what you were shooting. The image is reflected off of a mirror into a pentaprism so what you see is what you get. This was great for film cameras! But in our digital age, you really don't need that mirror as we have more advanced ways of seeing the image. So IMHO the mirror just wastes space and makes the camera needlessly bulkier. The future is definitely in MILC's as much as nikon and canon don't want to admit this. Many manufacturers and professionals are embracing the fact that bigger isn't always better.