Dear all,
Many thanks for your suggestions - very helpful indeed.
Skysurfer's advice re: sticking with a crop-sensor camera sounds like solid advice. I had already made up my mind for a 6D considering day-time shoots but may now have to reconsider it.
Armed with all of your advice, I can now conduct further research on what I should invest in. Cannot afford two DSLRs at the moment.
Thanks again, everyone!
