What DSLR camera should I upgrade to?

In about 6 months time I'm looking to upgrade my camera! I currently have a 1100D and I know that I want to stay with canon when I upgrade (I generally prefer there cameras). What camera shall I upgrade to? I don't mind spending quite a bit on a camera! I would quite like a camera with a reasonably fast burst rate. I don't want to spend more that 800. I would buy a second hand camera. It doesn't need to come with any lenses.

Extra question. Do you think it would be worth me facing my fears and switching to nikon? Do nikon offer a better camera for the 700 pound mark than canon or not?

TBH, I'd look for lenses and a flashgun - if your current camera isn't broken, there's no need to replace it.

Changing systems is just stupid.

Canon Rebel T3i, T4i and 60D. It's much better to invest into lenses later. There's no need to switch to Nikon unless you think there's a model that you would enjoy more and is also cheaper. D5100 is the only one right now, as the D7000 is quite above the 700 pound mark.

Here's a DSLR Buying Guide - http://www.smashingcamera.com/which-dslr-camera-to-buy/

Canon EOS 7D camera replaced my Canon T2i. It has much more professional feeling from any Rebel line, more functions, better shutter speed, light meter is much accurate with more options. The option of changing ISO in video mode makes a big difference when you can actually control the light on the camera and not in post-production. This Camera will blow out your mind, The Best one with affordable (For serious photographers), I have been using this with 70-200 mm lens and trust me its getting better with its age.