The nippons are still a cast piston, if you want to run a cast piston run your stock ones and buy a thick headgasket to lower compression.

Wiseco has the more advanced forgings of any off the shelf pistons available to Honda's. They come standard with a strutted skirt which reduces skirt area which in turn reduces friction, reduces weight (shorter wrist pin) and also come from the manufacturer with a coated skirt for break in. CP's have some very weak areas around intake valve reliefs on their 81.5mm pistons. Their 84mm pistons seem to be ok. Arias makes a very stout piston but it is rather heavy. In my personal motor I choose Wiseco over all others regardless of cost.