Common Lisp!
It can be a little esoteric if you don't have experience with the paradigms, but I've never used a language that felt more free.
On SBCL you have typing support, CLOS provides an OO interface, and it lends itself well to functional style programming (despite not having a type system as powerful as say Haskell). Additionally, the ecosystem is quite stable and mature, any library of functionality you might need is likely available.
Heh. I didn't know this was a common criticism of AC/DC.
It's definitely not unfounded but, the alternative is not always better. A good counter example is a band like Kings of Leon, who kind of split their fans along different album lines. Not saying there's anything wrong with that either, but I love AC/DC and am not upset that they have a pretty consistent identity across their albums.