Many thanks for your reply.
The product I'm thinking of buying is PowerCMS. In view of this I'm also now toying with the idea of iRite purely because I would then have an easy was of configuring the FCKeditor that's "built into" PowerCMS.
On trying the Demo of PowerCMS it "looks like" www.ckfinder.com is already integrated into it. I assume that this would work straight out of the box. I also assume that it does not come with iRite as standard and that you have added it into the PowerCMS solution.
I've had a look at all the suggestions you made and whilst they all allow file upload into folders for later browsing, none of them seem to have the ability to resize or optimise images. It's these functions that I would be after as the end user of PowerCMS (on this particular occasion) is not particularly capable of doing this (or indeed wants to do this) prior to uploading an image.
Or have I misunderstood? :)