Best books on Roman and Greek history?

Hi. Although I've always had a fascination with all things ancient Greco-Roman, only recently have I gotten the free time to actually sit down with some books and learn more in depth. I'm 100 pages through an abridged version of Gibbon's "The Decline and Fall of the Roman Empire," and so far it is great but a little hard to read because it's over 200 years old. Anyhow, I'm wondering what you scholars think the best theses on Rome and Greece are, and perhaps an Amazon link if it wouldn't trouble you. Thanks in advance!