Thanks a million. Yes that answers my question. All our projects are in
interlaced, but are looking to buy a DSLR which is in progressive, so looks
like I will be able to combine OK. Majority of our video is AVCHD 50i,
the new one will mostly for that extra footage we often need.
The problem you may run into is that shooting 25p won't look the same. There will be a noticeable difference between your current 25i material. You'd do well to consider a second camera that can shoot in the same format as your other footage.