I graduated from high school in 1999 and worked at a big box computer store during the spring and summer. I remember when the demo machines with the Voodoo3 3500 and TNT2 Ultras hitting the floor and all of us employees crowding around before the store opened to watch the demos, and endless hours spent arguing about which was better.
I saved up money to build my first computer that summer and chose a Creative 3D Blaster TNT2 Ultra, paired with an Abit BX6 motherboard, a Pentium 3 450 CPU, 256MB of RAM, a white box Sound Blaster Live, a 3Com Etherlink XL, a US Robotics 56K modem, generic 40x CDROM drive plus a CDRW drive, and I want to say an 8GB Western Digital hard drive, connected to a 19" monitor that was so big I had to pull my desk away from the wall to fit my Model M keyboard. It was pretty much perfect, except for the fact that technology was improving so quickly then that I started feeling the need to upgrade it in 6 months.
That fall I went to college and hooked it up to the university's broadband connection. I probably got my money's worth in all the hours I spent on that machine. It definitely gave me a sense of wonder and power to have something top of the line. I spent countless hours playing Half Life multiplayer, Team Fortress, and then Counter-Strike beta. I don't know if I'd do it again, but I had a great time back then.