I remember years ago when I had the WRX I put in a set of Infinity Reference series 2-way component speakers in the fronts and coaxials in the rear doors, and an MMATS 12" sub in a sealed enclosure with a 300w Alpine monobloc amp in the trunk. It was loud and pretty clear sounding, though I think the cheap-ish Pioneer deck kind of let it all down.
There was some chatter on here recently about JL going down in quality in the last few years. I know Infinity was descent but I have no idea these days. So are any companies left making decent speakers these days?