it depends on your build
if you're going some sorta consular or build which relys on force powers, by all means save them
but i found my 7/13 scout/sentinal to be far more efficient than my 2/18 scout/guardian =/
mainly because of the implants and i was so used to the immunity to mind-effects, man that sucked getting disabled for 20 seconds in the battle against darth bandon >_<
i know there is a killer build, which i might try out next which is the 7/13 scoundrel/guardian, you need lvl7 scoundrel to get all the sneak attack bonuses, which are applied everytime you force jump, stun an enemy, attack from behind etc
