Let's see... I'm late to the party so I'll throw a few ideas on the wall and see what sticks:
- Corsair iCue 4000D: seems to check many of the boxes. Glass panels, integrated filters(? Gotta double check), 140mm fans, great RGB (the iCue software has gotten better over the years), and ridiculous cooling potential. Maybe too big? Bit expensive ($200 ish)
- Fractal Design Focus 2: Smaller ATX case, cheaper build though. Filters are intake grilles. Okay cooling, but fewer options. Get what you pay for though, around 110-120?
Personal favorite (for you) so far:
- BeQuiet! Pure Base 500DX (currently on sale @ Newegg!). This one really ticks ALL the boxes! Tempered glass. Unique design. RGB. Solid cooling options (slightly less flexible than the corsair, but plenty). It's a BeQuiet, so it'll be quiet and comes with a couple of their fantastic fans. REAL removable filters! It's an interesting pick from a great brand, and isn't as flashy (if that's what you like) as regular cases that just show all the fans up front and center behind glass or a grill. Everyone has systems like that, so the different approach of this one is fresh and sleek, IMO. Plus, you don't need to buy RGB fans for the front panel so you can get more performance/ quieter / cheaper fans! There's obviously still a side window though, but a couple of top RGB fans or a (less-common nowadays) simple RGB strip tucked in behind an edge would light up the interior nicely.
Pretty late, but let us know which bits/features you like or don't like and we can keep going from there.
Edit: OH! Mustn't forget one of my favorite brands: Coolermaster! If you're going aircooling, the HAF 500 remains a beautiful monster. Giant RGB intake fans are flashy, unique-er than 120s/140s, and cooler better and quieter than smaller fans. The HAF 500 even has a little "spot cool" -esque fan, to aim some airflow directly at your GPU.... but it's kinda on the big side haha. It's not a super tower, but definitely a chunky case.
