In my opinion, Intelligence and Strength bobbleheads. You can pick up the Intelligence bobblehead before you reach level 3, and the Strength bobblehead comes in handy. I like to put 4 points into Intelligence and 1 point into Strength.  I use my level 2 level-up point on Intense Training to bump my Strength to 7. That immediately takes care of all the Strength dialogue checks with Moira when I try to get the Tough Wasteland Survival Guide perk (Which is the best one, in my opinion).