Mac user for 20 years, owner for 18 years. Personally owned about a dozen machines in that time, but worked on many more.
Best machines I've owned? In order . . .
1. 2000 model PowerBook G4, 15" Ti case - love that laptop and still own it.
2. 2010 model MacBook Air 13.3" - my wife's machine and one of the best upgrades Apple has produced in recent times.
3. 1997 model G3 tower (beige) - very solid, stable machine that was fast for its time.
4. 2008 model MacBook Pro, 15" - last of the non-glass matte screens; reliable and lovely to work on.