The only thing I'd comment on is to be sure that your resolve to move on from your X and into a new R, that you are fully committed to the new R. If your X were to want to come back, or some time down the road you start to wonder and pine and your X is available, well... I think you get the idea.
I have no doubt you know that. It is just the only thing that anyone who is starting to move towards new Rs would ever need to worry about, aside from how it might affect the kids or whether we are ready for a new R and don't take things slow.