...my users like the regular Reply page, but they need to refer to the thread.
This is a good place to tell users how to right-click the reply button, and then open up the link in either a new tab or a new window. That is what I do on the several boards I use, whenever I need to refer to the thread.
I don't even allow the quick reply window in my board -- it encourages users to be more "chatty". And I, for one, dislike that. If they
really want to post, I make 'em click at least once.