D-SLR camera help needed

I'm buying my first D-SLR camera and I'm a bit tossed. I have played around with SLR cameras before so I'm pretty good at using them. I'm just unsure of which camera would be best for me and would be the best value for what I'm looking for. I want something that takes good close-ups. I would also like it to shoot movies although that is not top priority. I would like to keep the price down to around $850 and either a Nikon or a Canon. I've narrowed down my choices to either: Nikon D5100, Nikon D3100, Canon Rebel T2i, and Canon Rebel T3. Any helpful advice would be much appreciated!

I would definitely recommend the t2i and if you are willing to pay a bit more, the newer t3i. I have a t2i and I love it. It's very easy to use, produces excellent image quality, and takes great videos. I also like the weight of it because it's pretty light when you think in terms of a dslr. The t2i is probably the best value for your money in my opinion over the competition, and there are things that I think that make it better than the d3100 and the d5100 such as the interface used to change settings. It's much easier to use and get used to on the t2i than both nikons. Also, if you want to take close ups such as macro shots, then you need to invest in a macro lens such as the canon 100mm f/2.8 which is a really nice macro lens.

Don't get rebels. At least get 20d but I recommend d5100. You'll have plenty of room to grow on that one but make sure you get good lenses too because they are what matter most. That and a sharp pic so get a tripod too. And don't skimp

Close ups with a DSLR are a matter of the macro lens, any DSLR will do. You'll be very hard pressed to get a DSLR and a macro lens within your budget constraint though, as macro lenses aren't cheap, $300 for the very cheapest there's, $400 for decent ones.

Don't write off Pentax. The Kx and Kr are excellent and affordable cameras.
But on make your decision planning on the long run. Get the camera that you feel most comfortable with, as you'll basically be marrying that brand - switching to another one is very expensive once you're invested in lenses.
Hence make sure that you choose the right one for you now, instead of the one that may have a marginally better first camera for you.

Out of those, if i were you and had to choose based on features, i'd probably get a D5100, as it offers top notch photography, full time autofocus during recording video as well as a jack for an external mic (important, as the autofocus makes lots of noise in the video if you use the internal mic). You won't get a macro lens with the remaining budget then though.