the kingpin version is for extreme OCing (liquid nitrogen comes to mind). IMO get the classified w/acx and use the extra $100 difference to put a waterblock on it.
If you don;t overclock, the galaxy hof edition might be better as both of these cards are deisgned for overclockers, or you can go for the zotac amp edition?
But the classified is designed for overclcokers too I think, just not extreme ones
Yes, the Classified is an amazing card for overclocking and has binned chips. Many people put it under a water block for serious overclocking. The KingPin is just an overpriced model that really isn't much better than the Classified.