I'm not a fan of the 800/840/8100/8500 case design. It is one of the worse cases to have to service.
I also don't much like the design (from a service point of view) of any of the iBooks. There was no (good) reason to make them that hard to service other than to keep people from upgrading.
I also thought the Classic II was a really poor replacement for the SE/30. The SE/30 was a great system that had the ability to be expanded well beyond it's default configuration.
By comparison, the Classic II was crippled. Ultra low RAM ceiling (10 MB), FPU was not standard, 16 bit data path rather than 32 bit (which made them much slower than the SE/30 even though both systems were running 68030 processors at 16 MHz), and no processor direct slot (or expansion slots of any type for that matter).
At any rate, those were my choices.