I see you have a Denon already. Happy with that? In this forum, you're either Denon people or you're not. As for the layer change pause, doctors differ...
Some will tell you that they experience layer change pauses with player A and not with player B. Another player will claim that his experience with player B is terrible, and that now that he/she has player A, they don't notice any pausing at all. I have a Sony 999ES that cost around 800 pounds, and it pauses all the time. I forgive it, though, because it delivers a fantastic picture. Again - field for a bit of opinion here, and then go test a few of the more coherent suggestions. If I were looking for a quality plyer that didn't cost the Earth, I'd start with the Denon 1920. But then I
looove Denons, and want to marry them ( as some here would probably tell you

)
So - my vote is for the Denon 1920. I'll leave it to others to shoot this down and give you a better option.
Edit - as for the buffer, I thought every decent player had this - if not every player full stop. Some players have bigger buffers than others - I know that much. But we're getting technical now, and a couple of weeks ago, I discovered that I didn't have to rewind the DVD after watching it, so please adjust your set by not reading any further.