Nikon or Canon DSLR?

I'm trying to decide on which camera to get. I'm a nature, portrait, wildlife, landscape, flower photographer and I know my way around the camera so I'm past entry level one. I want something with a nice quality and maybe some extra features,
I have my eye on the Nikon D5100…

Nikon

Well it's not really about the brand, it'd be much better to compare two models. Image quality is the same.

Nikon D5100 is a great mode, so are the D3100, Canon EOS T2i and T3i. D3100 is the lightest and smallest and cheapest, while the rest are slightly bigger and with more features.

Here's a DSLR Buying Guide - http://www.the-dslr-photographer.com/2009/11/which-dslr-to-buy/

I think you've got your eyes on the right camera! It is definitely one of the BEST cameras for not professionals nor beginners. It gives great picture quality, excellent video quality, low noise, good resolution and with all the great features it has i think it does justify its price. I suggest you should definitely read this review to get more details on this camera:
http://www.amazon.com/...LR8A4H60T/

I found a link where you can buy it as well:
http://www.amazon.com/...004V4IWKG/

You should definitely check it out. Hope this was helpful.

I would go with the nikon. I myself have a nikon p100 (i know its not top of the range but i'm only 15 and it does the job, i would like to get into photography when i'm older) my nikon is extremely reliable and tough, it has a setting for just about everything and the nikon customer services are really helpful.

Taking as read you have decided on the make of camera you feel is right for your requirements, remember it is the glass up front and the internal chip that make all the difference. It sounds like with your diversity of interest that you will need a range of lenses.use OEM lenses as they are computed to work with the range of cameras from the same manufacturer. A good cameras shop my allow you to try each camera to see which suites your needs as long as you leave a substantial deposit to ensure its return.

You know what you want, you know how to use it. Go out and get it.

"I know my way around the camera so I'm past entry level one"

Well the D5100 is an entry lvl dslr, anyway if you chose this one, AF on AF-D Lens won't work with it since Nikon didn't put AF motor in the camera body so people would have to buy lens with built in af motor + it work pretty much like a bridge camera were you'll have to go inside menu to change the aperture, shutter speed, iso. Usually beginners peoples don't mind it. If you can, try to get the body alone and grab a better lens than the kit lens.

Photographe has a point. It's still an entry level camera. Unlike the D7000 or even the D90 it won't autofocus with AF-D lenses so you're limiting yourself on what lenses you can use on it unless you plan to get the newer and more expensive version of the same lenses with the G badge on it. For example the great but old 50mm f/1.8D you can find new for $110 or used even for $80-$90 bucks. If you wanted an autofocusing 50mm lens you're either going to have to shell out extra cash for the 50mm f/1.8G ($220 also not as sharp as the original 50mm D version) or the 50mm f/1.4G ($440).

Also the ergonomics on the entry level D5100 compared to the semi pro models are much different. Having the extra dial so you can simultaneously control aperture and shutter speed saves so much time and can be a real help when shooting nature, wildlife, and even portraits (less time for the model to wait while you fiddle with camera settings).

If I were you I'd go with the D7000 if you have the money. If money is an issue, a used D90 can be found for around $550. With the money you save on buying used, you can get a few good lenses which is where your money should really be spent on.