First "gaming" computer? Or first computer that I got to play games on?
If it's the latter, then that would be my first pc ever as a birthday present when I turned 8.
486 100mhz CPU, 8-16mb (can't remember exactly) 540mb hdd, 1mb video card? 14" monitor etc
First "gaming" computer? That would be my current desktop. After a decade I finally have my first job and I can afford to build a current up to date computer for the first time.
i7 3770k 3.5ghz, 8gb 1600mhz ram, 3tb hdd, 500gb hdd, 128gb ssd, 2tb external, GTX 660ti video card, blu ray drive, 27" 3D IPS Dual Play monitor, 23" monitor, 21.5" monitor, 5.1 surround sound.
All up probably cost close to 2000.