Nikon's or Canon, are both good quality brands, I’m a Nikon man as I have over the years built up a range of Nikon Lens's and I still use my Nikon D200 (10 mega pixels) which is so old now, but I get the results I want, due to the nature of my photographic projects, that said I'd like to upgrade to a new one with full frame sensor, and would like better results in low light, but the one I want (D810) is just too pricey and I’ve spent so much on the recent GTI purchase.
Both brands know how to offer different features to pros and armatures, this way they can charge much more. That said something like the d7200 is excellent for an enthusiast and half the price of the D810.
I’ve had a look at the features on the 7200 and compared to my D200 its amazing, so you can’t go wrong and if you’re ok with not having a full frame sensor. If you want a camera with full frame, then expect to adds another £1000 or near abouts.
I use the below site, he gives great reviews on Nikon gear, worth checking out.
http://www.kenrockwell.com/nikon/