I do listen to more rock but am not a big fan of "bright" systems nor do I listen at concert levels (but on the louder side from time to time).
I will admit, I always have been intrigued with the British manufacturers mentioned (ProAc, Harbeth). The way their sound in described (good timing, fluid, etc) has tended to be how I prefer my system.
Other gear that I've owned and initially enjoyed (monitor audio, cambridge audio) just sounded way too fatiguing after awhile.
Look at Proac D Two and Harbeth SHL5. The Proac will be more dynamic with extended high-frequencies while the Harbeth will be slightly warmer, have sweeter highs and lower levels of listening fatigue. Both are revealing and have good timing. From your description it seems that the Harbeth may be a better choice for your listening preferences and priorities.