All Star Superman is a fantastic book. Why not read the first issue or two and see what you think?
The thing that does not appeal to me is the Crisis (on the only earth we were alllowed to use) - thank you Ambush Bug! Seriously, is it safe to re-enter the world of Superman? Can I pretty much figure out what going on?
You can ignore crisis, it's not a factor in the books.
Is Jimmy Olsen still Jimmy Olsen?
Yup.
Lois and Clark are married....
Yup.
Perry White still alive and still the MAN at the planet?
Yup.
What is Lex's status? Is he dead? A robot? A clone? president?
For
that, you'll have to see
Superman 650 and
Action 837...