My favorite computer was a 1.33Ghz PowerBook G4 12" SuperDrive (that later got upgraded under warranty to the newer 1.5Ghz).
That cost me $1799 but that was 11+ years ago.

------
Aside from my Rentina MacBook everything else in my current setup I got for free.
- PowerMac G5 - Free
- MacPro - Free
- iPhone 6 - Free (to be fair by trading in my iPhone 5)
- iPad - Free (well, my work owns it technically)
I did just buy a TiBook 1Ghz in good looking shape for $90 including shipping. Should be here by Thursday. Can't wait.
As a relatively frugal person, free is great.