On the topic of 90's "classic hits" on the radio, there are some decent examples out there of radio stations that are mixing in 1990's hits with their 1980's core. To do it properly, it takes someone who can go through and pick songs (usually on rock side) that fit the format well. There are some great songs in the 90's that fit very well, and there are other songs (while probably very popular) that should NOT make the cut. For the sake of example, here are SOME of the songs that I've heard that seem make sense:
The Wallflowers - One Headlight (1996)
Gin Blossoms - Found out About You (1990)
Goo Goo Dolls - Iris (1998)
B52's - Roam (1990)
Bryan Adams - Everything I Do (1991), Can't Stop This Thing we Started (1991), Please Forgive me (1993), Have you Ever Really Loved a Woman? (1993)
Tom Cochrane - Life is a Highway (1991)
REM - Losing my Religion (1991) or Man on the Moon (1992)
Depeche Mode - Enjoy the Silence (1990)
Duran Duran - Ordinary World (1993) or Come Undone (1993)
Sarah McLachlan - Building a Mystery (1997)
Sting - Fields of Gold (1993)
Jane Child - Don't Want to Fall in Love (1990)
Ace of Base - The Sign (1993)
New Radicals - Get What you Give (1998)
Sheryl Crow - If it Makes you Happy (1996) or All I want to do (1994)
Natalie Imbruglia - Torn (1998)
Oasis - Wonderwall (1995) [Can't stand this song, but it fits]
Smashing Pumpkins - 1979 (1995)
The Cranberries - Linger (1993) or Zombie (1994)
U2 - Mysterious Ways (1991), One (1992), Even Better than the Real Thing (1993), Beautiful Day (2000)
Semisonic - Closing Time (1998)
Alanis Morissette - Hand in my Pocket (1995), Ironic (1996), You Learn (1996)
There are plenty of others, but this gets the list started. I love listening to classic hits for the 1980's new wave sound, but none of the songs listed above would make me tune out. In fact, I quite like most of them. When you start getting into more of the CHR sound of the 90's, I tune out (and I imagine many other listeners would follow suit).