Don't forget about research. It takes time, a Psicraft check, and 200 xp per level of the power. And then it adds it to the powers on your class list, which you can take at the next level wherein you gain a manifester level increase.
Or you can ask your DM if he'll let you exchange the prerequisite powers for others, allowing you to qualify with some other power instead, because both powers are...sub-par.
However, you could also use my psionic powers revision, which makes both of them just a TAAAAAD more useful.
(There's also researching a feat that'll give you both protect ectoplasm and psionic repair damage at once, just like the Illithid Legacy and Greater Illithid Legacy feats from CPsi do (though the powers granted by those feats are inarguably better than pe and prd are...)).