> a decent, modern replacement for...G602

What's wrong with the G502? I like the wired G502 pretty well. Ideally I'd tweak the shape to be a little more like the M500s shape, but I'm happy enough with it overall.

I had a G502 that lasted years, but the last two I bought lasted me 6 months each (the wheel got completely gummed up somehow). I acknowledge that cat hair and sweaty hands are a bad combination for a mouse wheel, but that's insanely poor durability, and they're annoying enough to disassemble that they're effectively not cleanable.