Well, I started listening to Pink Floyd last year, around January. I wanted to see how their music sounded so I downloaded a couple of songs. I said, "Hey this sounds pretty good. I need to get an album of this." So I got Dark Side of the Moon (I downloaded some albums first). I think one reason I got into Pink Floyd was because I wanted something calming to workout to.
Ever since, I have bought 4 more Pink Floyd albums (Animals, The Wall, The Division Bell, and Wish You Were Here), and I have downloaded all of their albums for my iPod. I have to say, they really span a lot of cool music stylings. I suggest going beyond the albums from Animals to The Wall. Listen to Meddle. One of their greatest works that really inspired that gracefulness of Dark Side of the Moon. Listen to Piper at the Gates of Dawn for a pre-Gilmour taste of the band. And last, but not least, listen to The Final Cut, to really see how the band has evolved from being a psychedelic wonder to a concept king.