If you go radical and want to regain some low-end, there's always Rhodes lifters, but I've never heard tale of anyone installing them. Someone must have.
The Hesco RVOB cam is generally considered excellent. The 4.0 cam will feel ever so slightly "smaller" in the 258 then it does in the 4.0.
As a rule, the same cam in the same engine will get less radical as displacement increases, which can be good. The 4.0 (~242) and the 258 aren't too far apart, but some of the bigger strokers or the guys running 199s could find the "recommended" cam acting differently then they expect.
The Comp xTreme (sp?) cams are supposed to be good too, but require you to pick up the Mopar Performance springs to accommodate the increased lift.. The Comp and Crane springs also work, but are heavier rates, and harder on your camshaft.
It would be hard to find an aftermarket cam that wouldn't improve on the stock unit, though.