I have two classics, and I know exactly what you mean about the Gibson Hot Ceramic pickups.
There are approximately 59,467 pickups on the market. Some are good, some aren't, but everybody has a favorite. Deciding is darn hard, if not impossible.
So I finally took the plunge, took a deep breath, and bought a set of Duncan Antiquitys for the one guitar. Unfortunately, it took almost a year before I could get them installed, but I finally got around to doing it--and wondered why I waited so long.
The Antiquitys are everything that I could have wanted, and made a fantastic difference in the guitar. All those great PAF tones of Carlos, Eric, Duane, Jimmy, Mike, et.al.: they are all in those pickups.
What finally prompted me to install them, was that Duncan had made up a special run of 50th Anniversary Seth Lovers for Musician's Friend, and I bought a set of these for the second Classic. (Having the two sets around was making me fell really bad!) These have A2 magnets, and represent what a "new" PAF would have sounded like 50 years ago; the Antiquitys have "aged" magnets to sound like an old PAF.
Either way, Seymour knows his stuff. Both of these guitars are simply amazing. They produce sweet, clear, singing tones--with making my Boogies sound farty or flabby. I just recently bought a '58 Historic Paul, and its is a REALLY nice guitar, but my Classics now provide about 95% of the Historic vibe, for a LOT less money.
I'm not one of these guys that does a lot of pickup swapping, but I am very pleased that I made these changes with my Classics. (Another tip: I installed lightweight Gotoh tailpieces from Stewart-McDonald--another positive change.)
One advantage I felt the Duncans' had was in name familiarity--he's been around for a long time and the Antiquitys are well-known, respected and desireable. I had a good experience with a set of Antiquity Texas Hot Strat pickups that a previous owner had installed in a G&L Legacy. Those pickups have a delightfully smokey and complex mid-range. I had a feeling that the Duncan Antiquity humbuckers would be equally as good. These are his "best" pickups. And I felt the 50th Anniversarys would right there too, and they are.
Now, I'm using my guitars with a cover band, and we do all kinds of music--but they are usually low-SPL gigs. I am not blasting away with a full stack doing nu-metal. The Antiquitys are not wax-potted, so in those situations, feedback can be a problem. It has NOT been a problem for me, but when it has occurred, the feedback has been musical and controllable. So if you are playing really loud, a potted pickup might be advisable.
I don't think you can go wrong with the Duncans, each one has a little different flavor. One man's "greatest thing since sliced bread" is someone else's "hunk-o-junk".
I hope you found this helpful.