If you were to choose just ONE book from Kasparov's series My Great Predecessors and Kasparov on Modern Chess, which would it be, and why?

Not sure which series it's from, but I have "Garry Kasparov on Garry Kasparov: part 1 1973-1985". His playing and analysis seems a little over my head from the section I read though - I'll come back to it once I get a little better. I've been tempted to get one of the Predecessor books but I have enough to work through already :-)

I've taken several of the "Predecessor" volumes  out of the library, and I think they're all terrific. For some reason, the volume on Petrosian and Spassky seemed particularly good, but they're all first rate. But they're pretty serious books, and you really have to be prepared to put in some hard work if your going to get the most out of them. Gary's analysis is very deep and detailed!

I too like the one on Petrosian and Spassky from the Predecessors series, otherwise Kasparov on Kasparov 1973-85 is good, interesting to read his own description of his early years and games.

At your level, I'd suggest Silman's Amateur's Mind. However, if you are determined, go with what you like best. If you like "classical chess," read the predecessors series. If you like "modern chess," then buy the other.