P.W.
I don't really understand your dilemma -- if you want a new chair for comfort then get one, and then put the chairs wherever you want. If you think your 16 month old is going to mind where the rocker is, then ask him where he would like it to go. At almost 2 he should be able to tell you something.
Sounds like if your 16 month old has a chair in his room then leave that one there and put the new one in the baby's room.