Me, but mostly handwired tube stuff.
Don't spend any money until you have a properly treated room, that's the most important component.
The wall behind the speakers should have diffraction, and be 'live' sounding.
Bass traps at first reflection point, and rear wall. You shouldn't be able to tell the size of the room with eyes closed.
A bigger sub is better than more small ones. Currently using a Velodyne DD-18, and using a Marchand active crossover, biamping to the MG20's