Canon, nikon, or other?

I have the sigma 70-300 mm dl marco super. And a 28-80 mm lens ued on a nikon 65. I'm looking for a new camera that might use these lens, I'm not stuck on the lens tho. I'm willing to dump the lens if necc. I have been looking at cannon and nikon mainly. I would like to use the pic and movie mode as well as some amateur photography. After awhile it gets a bit confusing. I'm trying to keep the price around 1, 000. Or less. Does anyone have suggestions? Oh, one more thing, I have no idea what the point thing is, can you give instructions where to get infomation?

Both lenses will work fine on a nikon d90 or better