As for the Topic of the Day... Hmmm...
First Cassette Player - I think I was eight-years old. It was a Tandy/Radio Shack one.
First Radio A few months after getting the above cassette player, I purchased - well, my Mom purchased it, but it was still mine! - a Radio/Cassette player, again from Radio Shack. I no longer had to hold up my cassette player to my parents' radio in order to record my favorite songs from KING (we were living in Seattle at the time).
First TV To the best of my memory, I don't think I've ever purchased a TV. All the ones I've had have been hand-me-downs.
First Record Player I never purchased one. I just took over the Panasonic that my Dad had.
First Stereo Rig Something cobbled together from various components when I was in high school.
First CD player A Sony 5-Disc changer sometime in 1986. It was on sale at Circuit City, and cost just as much as a single-disc player at the time.
First Laser Disk Player N/A
Most extravagant purchase Hmmm, probably the (RED) iPod Nano I bought a few years ago... Then left on a plane.