Depending on. skill and experience, if you have a high budget, you could try the Butterfly Viscaria, but depending on your level Viscaria could be a bit too advanced and have a negative impact on your technique.
If you want, you could try the Primorac which has a bit more punch to it, but it will probably be heavier than you are used to and the feeling of looping the ball will have quite a different feel to it. It tends to be slower than the Korbel and the handle is smaller than usual.
You could also try the Maze which is quite similar to the Korbel and roughly the same thing. Overall, if you liked the Korbel and if it feels good for you then I suggest for you to go with it.
With rubbers, I prefer tacky Chinese rubbers as they generate lots of spin. I generally use the H3 Neo on both hands at diff degrees. If you prefer European or Japanese, the I would recommend Dignics 09c, 05 or the Yasaka Mk5 for forehand and backhand, you want bouncy rubbers such as Tibhar Evolution, Butterfly Shriver and Andro Rasanter. The last one is on the soft side. For backhand you should generally pick hard rubbers depending on how you play your backhand shots.
This is all in my opinion so try out some diff setups and find one that you prefer🤪