Which is the better dslr camera?

A nikon d3200, a cannon rebel xti, cannon eos rebel k2, or a CanonRebel XSi im not a pro but i love photography, so nice pictures i want a little digital screen and let me know which ones if any can shoot videos if any thank yall
Added (1). Please only anwser if you can help,..
>>> Which is the better dslr camera?

My Nikon d3100 wont take a picture with flash, why?

I have this Nikon D3100 for less than a year now, but suddenly I whenever I try to take pictures with the flash, it doesn't work. The camera will take pictures on the no flash settings, but when i put it on auto, or any other settings it wont work. The internal flash will pop up and It will focus and make the beep sound like its ready to take a picture then, no picture will be taken.if I hold the internal flash down while i take a picture so it can't pop up, then the camera will finally take a pic. I really hope this isn't an internal problem, because i don't have a lot of money to get this repaired. :(
>>> My Nikon d3100 wont take a picture with flash, why?

Will a Nikon Zoom-Nikkor 50-300mm f/4.5 Non-AI Manual Focus Lens fit my Nikon D5100 DSLR?

Will a Nikon Zoom-Nikkor 50-300mm f/4.5 Non-AI Manual Focus Lens fit my Nikon D5100 DSLR?
Added (1). Andrew. I was just about to bid on that lens.then I saw your Answer. Thanks so much! You just saved me $150!
>>> Will a Nikon Zoom-Nikkor 50-300mm f/4.5 Non-AI Manual Focus Lens fit my Nikon D5100 DSLR?

Is the Nikon D5100 good for a complete dSLR novice?

I know about ISO, aperture, shutter speed and basics like that. I'm in love with photography, but I only have a Panasonic TZ20 (which I hate) and am looking to upgrade.
>>> Is the Nikon D5100 good for a complete dSLR novice?

Can i use reverse mount technic with Nikon 18mm - 105mm lens?

I have a nikon D200 camera. The lenses i have is Nikon 55mm -200mm and Nikon 18mm - 105mm lens. I saw a video on reverse mounting.So Can i do that with any of my lenses. Please help.
Thankyou :)
>>> Can i use reverse mount technic with Nikon 18mm - 105mm lens?

Photography help? (Beginner)?

Does changing lens of a camera affect its image quality?

Suppose i have a nikon slr camera without lens and if a buy any nikkor lens like 18-55mm will it work with the camera ?
>>> Photography help? (Beginner)?

Can someone please decode what my camera lense means thanks?

AF-S Nikkor 18-55mm 1:3.5-5.6G VR

what's this all mean D:
>>> Can someone please decode what my camera lense means thanks?

Nikon pro staff on a Ruger American Rifle?

I'm getting a Nikon Prostaff Rifle Scope 4-12x 40mm Mil-Dot scope for my Ruger American Rifle, what rings should I put on it, I'm a small guy so I'm probably going to need lower rings, but I don't wanna ruin the finish scraping the scope, so what do you all recommend?
>>> Nikon pro staff on a Ruger American Rifle?