Professional photographers require a level of customization, performance, and ruggedness that's at least a notch above what consumer dSLRs provide. Compatibility with a broad range of accessories and studio equipment is also a must. If you have professional aspirations or are a seasoned pro going digital, these are the models you should consider. They require a serious investment, but in exchange they'll give you state-of-the-art imaging technology and the breadth of creative control you need to produce professional results.
After extensive product testing, Which Digital SLR Camera? has named the following DSLR cameras the best and top-quality professional DSLR brands and products for advanced photographers:
Canon EOS 1D Mark III Canon EOS 1DS Mark III Nikon D300 DX Sony Alpha A700 Olympus Evolt E-3 Canon EOS 40D Pentax K20D Canon EOS 30D Canon EOS 5D Nikon D200