Disagree. Hypereutectic is suboptimal for a diesel application due to brittleness. The main plus of the hypereutectic is low thermal expansion allowing closer piston clearances primarily to reduce emissions. You get some bulk strength increase, but at the cost of higher brittleness and lower toughness both of which are pretty significant for a diesel application.
Never heard of anyone having real problems with the stock cast pistons - they seem strong enough to handle pretty much anything a normal driver would throw at them. If anything, the main failure mode is thermal damage due to overfueling or cracking, and neither one is helped at all (and in fact, hurt to some extent) by a hypereutectic alloy. Higher strength is only really going to help if the failure mode is structural - ie piston pin pulling out of the skirt.
In fact, these pistons are tough enough that I made it over 100 miles on a turboed engine at ~15k with substantial damage to a piston due to a dropped valve - the piston had a ~1/2 hole clean through the crown and a valve head completely embedded into the crown.
I would submit that regular old stock cast pistons from a reputable manufacturer are perfectly fine. Only thing I would do is ceramic coat them.
~John