Hey Scrooge, my pleasure.
Of course, your appreciation for most of the books I mention will depend heavily on your tolerance for early superhero stories in general, which do tend to be very primitive in terms of the writing. The earliest Siegel/Shuster Superman features (say, Action 1-20 or so) are a great place to start though... IMO, they're just plain fun... the stories hadn't yet fallen into formula, and you get this sense of feverish excitement as Siegel & Shuster discover what they can do with this neat character they created. And as Norinn mentions above, some of Bill Finger's early Batman stories have a similar kick to them. The other titles I mentioned tended towards more formulaic stories, although some of the weirder 2nd- & 3rd-tier heroes and WWII plots still keep things interesting. Hope you enjoy!