ZX Spectrum 48k. :-)
My dad bought it in 1084, I believe. In 1986, he bought us a C64c, and sold the ZX Spectrum 48k. I was sad that the Speccy had to go, but in my dad's mind, when you upgrade, the "old" computer/device/machine/object/whatever is no longer required. :-x
I must admit that the MOST fun I've definitely experienced with C64. :-)
I got into Amigas in the summer of 1995 (late start, I know).