Seth Godin reported that a study of behavior at buffets showed that the first item seen was chosen by 75% of diners even when the order of the items were reversed.  That 2/3 of all the food taken was from the first 3 items.

Your first idea is more likely to be chosen based on this behavior.  However as former radio owner Jerry Lee once told me, if you have three choices on a list, the respondent is more likely to choose the middle option (#2).  But when it comes to brainstorming new ideas, researchers have discovered that the worst idea is the first idea.  All of this gives new meaning to “first” – what you want people to do is all about understanding human behavior.