WCBS-FM would be the perfect place for a refurbished Optimod 8100-XT2, since they play exactly the kind of music it was designed to deal with best. Leave the 8500 for the HD channels nobody listens to!
Now that combo was great in it's day, but let's be real here. Mike used the same 8500 and had it sounding better than any other 8500 I've ever heard. Yes he had his magic modified Mike-ized Behringer box inline (which is gone now) but it was also how he got that, the Ariane and the 8500 to all play together.
Putting the 8100/XT2 on the air now would put them at a major disadvantage as far as cleanliness, music punch and vocal clarity goes, never mind loudness. While I had the Omnia.11 on the bench I ran oldies through it to see what it sounded like... whoa, I could tune that thing to make the old recordings stand up with the newer stuff and give it all punch. VERY consistent. Same thing while I had a demo 8500 and the Omina.9. The Vorsis Air Aura re-eq'ed the old stuff and left the brighter recordings alone very effectively. Even the Omnia.One did okay on the oldies, just more distortion on the clippers.
It's not the processor. It's the person or people adjusting it that count. It's a rare skill to be able to make a signature sound for a station and have it carry across all elements; music, voice, production, spots, imaging.