Woken

Hi all, I am upgrading my home studio and want to upgrade the speakers also. I am currently using the M-Audio BX4's with no sub in a room with no sound dampening whatsoever, they go surprisingly well despite the price tag. I am moving into a room in which I will add sound dampening, and I have the opportunity to buy a pair of the R-15PM's for about half that of retail, I was thinking about adding the R-120SW to pump the low end. Question is, how good of a setup would the above be? And would it be practical for using to create, mix and master music on? I produce electronic, rap and pop. For tracks that contain more intense vocals or tracks that are aimed to be considerably popular they will get sent off to a professional mastering studio, but for the more "just for fun" tracks I will be mastering myself. Any advice greatly appreciated