The Sony Alpha A900 was, I say was top of the line when I purchased it.
I hear ya on the file transfers, a FTP server would serve you well this way your client could each have a pass protected directory that they could share with ?.
I had a 4x5 and an 8x10 Cambo large format cameras, the Sony digital a brand new HP wide format, imagine ink cartridges with a chip to tell you they're out of date or near empty. A thousand dollars to replace the cartridges and that damn printer every couple of hours goes into auto pilot cleaning the ink heads.
Also had a digital back for the Cambo 4x5 large format but you can also get adapters to affix any digital camera onto a large format camera.
After me an the old lady split the sheets did not know I had a daughter in the oven, my daughter had just turned 20 when we had our first face to face. she has chosen to be a professional photographer.
At the time I had no funds to contribute towards her education, instead gave her all of my camera equipment.
I wanted to get into doing platinum prints, now I'll settle for making a pin hole camera out of a shoe box and do some carbon.
Chemicals used for carbon print, carbon black, gelatin and one other that currently gaps my mind. This link is live for the next ten days
Modern Carbon E-Book, by Sullivan.
http://ovh.to/kB9CANG