Madness my arse ... you sound perfectly normal Oscar. I'd consider the 458WinMag as I believe it's the cheapest bigbore to run. If your after a CZ, I think they also make a 416Rem which would also be a consideration as you can use your H&H brass to make the 416's. Projectiles cost more though in 416cal than in 458cal.
My only concern with a CZ 458WM is that they can be prone to not feeding well ... typical factory rifle issues that can be rectified by a good gunsmith.
Cheers...
Con