Lust is a terrible thing. I looked at the websites posted earlier they almost make you wish your engine would wear out. A couple of years ago I contacted Barrett Precision Engines that advertise at this site. People around here swear by them - it would not hurt to click on their button and ask for feedback on your specific plans.
Try Klaus Savier at LightSpeed Engineering. He provides FORGED pistons for many engine makes, and his pistons are used by many who have gotten great engine performance increase!