Attributes you should consider when considering buying a
     SLR Digital Camera:
      The absolute requirement you should consider is not to go below 6 megapixels. Megapixels are 
         not the only consideration but you want to have sufficient resolution for large prints.

        Here are some other pointers:

• Resolution
• Crop Factor
• Lens Mount
• Lens Availability in terms of both focal lengths and quality
• Noise
• Accessory availability, especially vertical grips, flashes and romote controls.
• Upgrade path from Manufacturers (are there better bodies and lenses available)
• Battery type ( AA NiMH or Proprietary Li-lon)
• Continuous Frame rate
• Mirror Lock-up
• Spot Metering
• Memory Card Type (Compact Flash or Secure Digital)
• LCD Size
• Viewfinder Magnification
• Shutter Rating (cycles)
• Size and Weight
• Ergonomics
• Price   

 DigitalSLRinfo.com