If you're looking for the best, I'd say the Canon 5d mark3 with the Canon 17mm tilt/shift lens. But that might be overkill for your needs and budget. The Canon T3i or Nikon D5100 would both be good options. A tripod would be more important than a fast aperture lens. Keeping the camera perfectly level is very important when using a wide angle lens. Plus with a tripod you can shoot longer exposures in low light and still get sharp photos. Shooting on a tripod at f/8 will be better than shooting handheld at f/2.8 anyway. If you get too wide you'll get distortion at the edges of the frame. But if you want really wide, look for something in the 10-12mm range. Just make sure it's NOT a fisheye lens.

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