Anyway, I'd like to point out that you CAN take a Prestige Class at the level you gain a feat- as long as the feat is gained from pure levels, not a class bonus feat. The reason for this is because when you level up, you FIRST choose what class you're going to be, THEN you gain the skill points and class abilities for that class. For example, if you need a feat or skill ranks for a Prestige Class, and the class allows you to get the skills and/or feat at 4th level, you cannot take the Prestige Class until 5th level, since you had to take the 4th level of the class in order to get the skill points and feat in the first place. However, if you get the feat due to levels (like the feats you get at 3rd, 6th, 9th, and so on), you can choose to get the feat before or after you actually choose what class you're going to be- so if you need the Great Fortitude feat for a Prestige Class, and you're 5th level, you can gain the Great Fortitude feat upon achieving 6th level, and take the Prestige Class as your 6th level class.