macintosh duo 280
Apple Macintosh Duo 280 - with 12 megs of RAM and 240 hard drive.
After my Powerbook 180, this was a major improvement.
This machine was black and white, unlike the Duo 2300c. Except when you plugged it in - then it was just as fast and pretty as the desktops around me.
I later upgraded to a Duo 2300c.