I'll go with the star system, as far as difficulty to obtain in trade. I would want some sort of upgrade to make the trade in any case. Better player (most likely) or a similar Cubs player for unstarred cards.
37 Hundley Padres
88 Arcia Twins
93 Sweeney Cubs *
122 Papelbon Phillies
132 Alvarez Marlins
135 Sogard A's
234 Stults Padres
248 D'Arnaud Mets *
265 Ventura Royals **
298 Getz Royals
330 Longoria Rays **
37 Hundley Padres
88 Arcia Twins
93 Sweeney Cubs *
122 Papelbon Phillies
132 Alvarez Marlins
135 Sogard A's
234 Stults Padres
248 D'Arnaud Mets *
265 Ventura Royals **
298 Getz Royals
330 Longoria Rays **
