I've had the same dilemma for many years! I tried all sorts of different speakers but always went back to the LS3/5a. I used them with a subwoofer - compensates for most of their deficiencies, especially if you cross them over at 120Hz.
Rogers LS3/5A Replacement Recommendation
I am looking to replace my Rogers LS3/5A (15 ohm) speakers. My biggest complaint is lack of bass and size of sound. I was considering Proac 1SC, but not sure if it would be big enough improvement. I need to stick to monitor size speakers due to space limitations. Any recommendations would be great. Looking to spend under 1500 used.