Sega Dreamcast. It was ahead of its time, at the time. GD-ROM (1.2Gigs of data in an era of CD), Dual pressure sensitive triggers, modem, ethernet adapter. Even the memory card was a portable minigame device.
It was the last console of extremely unique games, most of which were absolute bangers. Rez is still one of my absolute favorite games of all time. Space channel 5, crazy taxi, jet set radio, shenmue, seaman, chu chu rocket, power stone, techromancer, and many many many others.
I couldn't convince my parents to buy me one when I was younger.
Now I'm an adult and the Mrs. Won't let me buy one either
EDIT: it's a joke people. I just don't have a TV that will connect to one and I have way more pressing money matters on my hands than buying very old consoles and trying to make them work. Seriously though, it looked wicked when it came out, well ahead of its time, then seemed to die off despite being (at least on paper) one of the best consoles available. RIP Sega consoles.