Polish-American or real Poles too ?
I would rather prefer people who are best known for Americans. I know they can be familar with Golota(but 53 seconds last time dismiss him for me).
Paderewski would be OK.
How about writing an explanation of the first years of Baseball in USA? I heard that first Poles in USA brought a new sport there, called Palant and after few years Irish people changed few rules and called it baseball. I would be so happy to see my classmates faces who cheer Red Sox's team and think that this REAL american sport is best one here, after hearing the REAL story about their favorite game.
Walesa is a Nobilist and really important guy for Poland. Though his influence on US history was rather little. I don't think many people could remember him(anyway-even my history teacher doesn't even know who Kosciuszko and Pulaski are...)
thanks for many helpful answers ;)