I've read the original trilogy, that was apparently a weekly story he published in the fifties and then had slapped together in later years. personally I felt they were too disjointed, but there you go. foundations edge, foundation and earth, prelude to foundation and forward the foundation I've read, and did find them a bit more on the cohesive side. even if Asimov liked to play "I have a secret" more than any other author I've ever seen. (still not over the watch face thing from pebble in the sky)
Catbar, don't let the numbers get to you, books are only words, and its only time. if you've read more than seven books in your life, than seven in a single universe isn't all THAT bad. after all there were 4 robot novels that more than half the foundation stuff. and if you read the m by time in the galaxy you'll run across Daneel and it'll at least keep you going through the foundation trilogy. yes high in Science fiction, non-existant fantasy, but never did like the lack of continuous characters, or story for that matter.