The larger 25 cent issues from DC were a great find for me and it was those back-ups that sold me. For me, more importantly than the Kirby stories, were the Plastic Man reprints, in Jimmy Olsen and the 100 pg. Giants.
That's the time I was getting back into comics, although my memory is a bit blurred now and I was intrigued by the early stories of Kirby's 4th. World.
Loved Sandman. But the original uniform was much better.
As for Kirby, I was an avid reader of F.F. and Cap. America when they came out. Cap. especially, as I'd never seen this exotic, colourful character before, G.A. comics not having been available here. As his work deteriorated, during and after Mr. Miracle, I read less and less of his new material and that affected my re-reading of his F.F. particularly, and I no longer take any great enjoyment in those early comics. This is almost heretical, I suppose but, looking back, I just don't think they are any better than many other titles of the time or later '60's with Ditko's Spiderman beating the F.F. by a mile, in both art and story.
As for the comics, I found lots of them and still have them on my shelves, so they only cost me cover price.
A bit off topic all this as I haven't addressed the subject of The Guardian.