I like either the .458 275gr Lehigh or the 325gr FTX. I never tried any of the 300gr Lehighs though or the 220gr. The 52x475 options are probably fine but there are a ton of good .458s on the market.
I really like the 52cal too if you want to shoot the larger bullets faster. The Knight/MMP 52cal sabots are extremely tough and should handle any load you can.
I would have preferred Knight improve on 54s with 50cal bullets but i am very biased about the 54.