I own two of the books mentioned here "Knowing God" and "Doctrine of the Knowledge of God".
I must say that even though I've been a christian for 4,5 years, "Knowing God" by Packer was a real eye-opener for me. Full of insight and sound, practical teaching. So many of my misconceptions were corrected. A real gem. Packer in his book draws a disctinction between knowledge that puffs up and wisdom on the other hand, which we are supposed to grow in.
OTOH, I haven't read all of Frame's book. The reason for this is that it is somewhat too technical for me, at least at this stage. I might open it again in a few years and then it will "click".