The A500, shortly after I got a 512KB trapdoor expansion since I bought a game that required 1MB.
Since I was quite young back then that was quite a large amount of money for me 
Its a bit longer love story.
8 bit - all plain, casette, console
Speccy, thin CBM64, Sega Master System
16/32 bit
A1200HD 60MB
+Accel 020/28 4MB FAST FPU
3,5" HDD CD ROM, OS 3.5
Suffering pon Windows
Discovered Linux.
Now AEROS on x64
Linux and AmigaOS 4 on SAMs
Linux and AmigaOS 4 on X1000
Soon MorphOS jumps in