Some cases simply had soul, I really had nice PC cases at least for my taste.
But I didn't change a lot of them. Last 15 years I had Coolermaster CM690... that was attractive case back in 2006-2007-2010. Off course I had Window side panel almost when first become available. CM made panels for some of their cases and mine.
Then I bought Obsidian 650D 2012. Case is simply fantastic and from my perspective that will stay nicest PC case of old style before radiators for watercooling become more popular. And now I have classic original Lian Li PC-O11 WXC version with USB 3.1 Gen 2 Type C front Panel upgradable and usable on PC-O11 WX model and on White Model. All of them are different type of case because I can't buy twice case of similar style.
Next case for 5-6-7 years will be Mini ITX/ DTX compatible case, need to be full aluminum. Advantage are small brands who use original Lian Li factory to produce aluminum case for them or Lian Li if decide to continue tradition, neeed to have at least 3-4 PCI-E slots, and option for 2x 240mm radiator and watercooling will be out of case. But that's somewhere little longer in future, first I'm not full-fed, not even close... with watercooling inside case and E-ATX motherboards. Switching on Mini ITX depend and from IT industry. They need better motherboards, better cases, smaller pump/reservoir combos...etc... DTX Form factor could be installed in most Mini ITX case and have space for slot for dedicate sound card because I'm deaf with SupremeFX... etc...
Off course I had some dreams I couldn't afford as Caselabs S8S Limited Edition Gun Metal, or In Win S-Frame, Lian Li PC-O7/O8/O9 but never mind.
Except them I didn't saw some specific cases that I'm very sad because can't afford them.
CORSAIR had some iconic models 800D/650D/600T. That was CORSAIR for me.
They had so nice idea in that period compare to other manufacturers, 2010-2012 everyone wanted CORSAIR PC case.