Eos-1ds Mark Iii
What kind of new camera (DSLR) would be compaired to my old medium format?

That was a wedding photographer for many years and gave me everything until I got married. At that time it was all digital … so I'm looking for something that would be similar to my Pentax 645 (medium format) camera. Me like the Canon EOS 1Ds Mark III, but I'm not sure what else is out there. I'm starting my research, so any idea or help on the subject would great!

Leica, Kodak and others make medium format digital camera Hasselbad. If you want to stay with medium format, which could be the best choice for you. You can stay with medium format and not have to deal with one more film. Check out the Leica S1 and Kodak 913.