You could do very will with the 6 case incentive cards. I don't know if you know but there are several different badges you can get, the Cadet Badge is numbered out of 65 and are all the same and there are 40 Starfleet Badges but out of that 40 there are 4 different types, each with only a very few made:
Engineering - 5
Science - 10
Medical - 15
Command - 10
Also, if you had gone for 15 cases the additional incentive was an Archive box which has every insert, every costume card and every Autograph card (the only thing it doesn't have is the 6 case incentive card), although as you said, you still have a chance of finding a hidden Archive Box in your cases but I believe there are usually only 10-15 of those in the whole run.
Last edited by Incarnadine; 05-13-2009 at 02:51 PM.