My first Atari was a 130XE. I now have 800XL's and a couple more XE's, but my favorite case design is still the XE. It just always seemed like a futuristic case to me, while the XL beige case kinda felt more like the previous era. Of course, beauty is in the eye of the beholder.
My Atari (no affiliation, but a happy customer since the 90's) still has a ton of (brand new, old stock) parts and (in some cases) brand new computers, and they're stored in beautiful northern California, so they don't get any UV damage. They're also absolute knowledge sinks for Atari's (both 8-bit and ST):