Even the aftermarket head units of that time sort of jumped out at you, mostly from bright glowing buttons.
As far as unobtrusive, consider this:
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No CD option but you can mount your phone onto it and bluetooth everything from that or use USB sticks. I used one for a little while and it was a pretty decent unit. If you have an uncommon or old phone it may take some doing to get it to shake hands with the head unit. Mine worked easy, my dad had to call
Crutchfield to walk him through a fix.
That said, if
Crutchfield still has them I'd order from them. Hell, you may even call
Crutchfield and just tell them what you're looking for and they might could offer you some ideas to check on their website. They are very good at giving you ideas when you know what you want but don't know what's on the market that'll do the job.