Are you interested in a full amp+speaker setup, or do you want powered?
Open to either, I think. I don't really want huge 1980s style equipment though, i.e. a stereo receiver.
Depends if you want high quality bang for buck, or if you want to push into more audiophile costs.
What would be a step above the A5+?
Audiophile costs is a rather nebulous phrase.
Edit: Don't really gave space constraints, but also don't want to clutter things up too badly (see above comment). My subwoofer is on the floor in front of my desk, there's two or three feet before the TV area starts.