http://www.net54baseball.com/showthread.php?t=240530
Since the majority of Jackie Robinson cards are post-war in sets chased by PSA Set Registry guys, you will have a smaller pool of cards to consider buying. Not all cards in PSA slabs are overpriced, and BVG slabs will normally save you money compared to PSA/SGC.
It really depends on you. Do you want to wait around for the right cards to come along. Would you enjoy doing the PSA set registry for Jackie or others? When do you plan to resell these cards?