i'm trying to decide between the lippincott micro cards and the lange cards...the store wont let me open them up to look inside and once i buy it's nonreturnable. any suggestions? i'm looking for something w/ a clinical scenario on the front and details about the bug on the back. pics/diagrams are good too and it'd be sweet if they broke up the cards by category...i.e. gram positive vs. gram neg thanks!