What would constitute an upgrade for you? What do you wish your current speakers did differently?
If you even only occasionally crank up the volume to high SPLs, then you need good sensitivity - which you have now. Many other highly sensitive speakers will have wider profiles, taking up more floor space.
If you are looking for, say, a smoother, more accurate response, the question may become one of whether you have enough power to get what you want volume-wise. I went from Klipsch to Monitor Audio in my main rig, and am very happy with the sound, but also have plenty of power on tap - more than I use, for sure. A brand new pair of their Bronze 5 would be in your budget, and could be worth your consideration with their high-tech drivers, but you'd be giving up some sensitivity. Which brings us back to those first two questions.