Aros 68k together with Rom Replacements from Toni Wilen.
I run four of Cosmos's patched libraries on my A2000. And three on my A500. Along with several of Thomas Richter's libraries, and Peter K.'s fabulous icon.library... I doubt many of my libraries at all are "original", anymore. For me this works great, gives me a very "modern" and fast environment, I can't speak for others. Honestly sometimes I'm surprised my systems don't just burst into flames, running both Cosmos's libraries and THoR's.

Question though: I've always heard that AROS 68k libraries are huge "resource hogs", and "run like a dog" on native 68K systems. Not to bash all the hard work I know the authors have put into them, I just don't think (based on what I've heard) that they're right *for me*. Can anyone confirm performance of the AROS 68K files on actual classic Amiga hardware? Maybe that would motivate people to switch?
Heck, if Cosmos put his excellent optimization skills into AROS 68K, maybe they wouldn't be so slow? :lol: