I use the FS52/BS22s for music and they're perfectly fine with it; I don't see it as a weakness at all. A good speaker is a good speaker

I listen to a LOT of different styles of music and they're fine with everything so far. They are not perfect speakers as they do lack some refinement expected from a more expensive speaker, but at the price point I think you'll have a hard time finding anything that is significantly better for the same price. The only thing I don't like about them is their very plain appearance.
I picked up the original energy Take system for my dad years ago and it IS a very solid little package. I wouldn't recommend smaller satellite speakers for music though.
There is no such thing as too much sub. You can turn it down to achieve the desired levels, but if it is not enough, then you're stuck with it. Pretty much all subs in the under ~$300 range are only going to get you to 25Hz realistically, so really you are looking for a proven performer.
I love Mordaunt Short, but if they have one weak point, it had traditionally been their subs. I haven't heard the one ziegl01 recommended though.