I have had some flirting with:
Microdigital TK-90X (a spectrum clone) - that was my first computer and with it I did my first steps into programming.
Commodore 64 - that was my favorite gaming machine
Atari 65xe - Nice machine, cool looking, I was more interested in its different OSes than anything else
Macintosh LC631 - It is still a very comfortable classic Mac to tinker with.
Sun Sparcstation 20 - It was so awesome and so elegant to work with Unix and OpenWindows with two processors and 128MB of RAM!
IBM AS400 - Pure horse power and top of the line security.
I currently only keep the C64, the Mac and the Atari. I still regret I sold the others.
From time to time I fantasize about buying a SGI O2, a machine I allways wanted , but shipping costs are so damn high!