I briefly thought about going retro, and installing my old system. For whatever reason, I still have all of my old stereo gear from 20 years ago. Pulled it out of the cars I had then.
High end Sony cassette deck, 2 10-disc CD changers, amps, etc.
Then I remembered that CD changers are a PITA, cassettes are inconvenient, and I still wouldn't have bluetooth or satellite radio. SO I went with a new Sony CD deck that has all of that stuff.
I'm trying to find a decent C1500 reg cab, so will probably put the retro stuff in that.