I second the choice of the HC50II, HC120II and the HCD28. I also use the HC100 and the HC80 for portraits. But my favorite piece of equipment on the H5D-50c is the HTS 1.5 - I use it mostly with the HC28 for landscapes and with the the HC80 for studio work; make sure to get the "Snapi tilt calculator" app on the iPhone when using the HTS 1.5.
Cheers and happy new year,
Masud
Cheers and happy new year,
Masud