Forged stroker pistons - recommendations?

Personally I don't support the use of hypers on the 4" engines. The piston speeds these engines can develop at 5K are right on the hairy edge of safe for hyper materials. I'd rather not use them there. I'm not down on them - I run them a lot in other stuff but there's a reason better piston materials exist and piston speed and dealing with it is a bog one.
I've had Ross and they are not my favorite. I'd put them on par with Icon. Not "bad", good value, but not my first or second choice. I like SRP and then Diamond. Diamond is more money which is why I place them second. SRP makes a really nice quench dish that's only 17ccs. That might be a good compromise for you but they don't offer a flat top. I'd go Diamond for the flat top.