I had a similar thought - to replace the king-size bed that W sold after asking me to move out with a new one when I move back into our house (I bought her out of it). My thought was that this would be more comfortable for me, but would also signal that I was moving on, perhaps even relationally. It seemed important, as XW had offered me a small fullsize bed to have instead - seemed like a strong suggestion for me to be living solo, and I'm not sure her being comfortable with that idea is a good one.
I admire your getting a new place so quickly. I'll have my place back sometime in August. That won't come soon enough and will be good for my son, too.