I bumped into a couple of players tonigh who misunderstood the rule on leaders.
Remember, you can only have ONE LEADER in your flotilla, NOT one of each type of leader. (Some races only have one type of leader, and the ability to take one of each type would be very unfair to them.)
The only exception, as listed in the rules, is interceptor leaders. You make take more than one leader only if BOTH of them are interceptor leaders.
The idea is nudge flotillas into historical compositions as a natural consequence of the shipyard, without making a lot of rules that have to be remembered. Thus you get one leader, one support PF, and the rest are the line PF's you buy in the supply screen.
-Herr Burt