An interesting topic I think considering the release of the Rivals rankings and talk about "this kid's offer list warrants a top 100 ranking." Of course, sometimes getting offers from schools can depend on geography and the familiarity with a program, as well as position/style preferences of a program. Another factor is how national your recruiting goes. Teams like Alabama are extremely selective, but since they try to go hard nationally, they'll throw out a few more offers than other powerhouse programs like Texas who can generally select many of their players from instate.
So generally what is the hardest offer to get? I would go Texas and FSU. Maybe USC but that might also relate to scholarship limits for the time being. Do people generally agree?