Nikon, and always nikon.
why?
because i've always shot canon for work and they ALWAYS seemed to break down.. even the 1 series from the vhs, to the d, dmk2, etc... yes, digitally we know canon's better, etc etc.. but after my bodies continued to fail me after less than a year's use,(followed by a ridiculous bill from CPS,) i totally gave up.
Even better, was the constant testing for "sharpness" whenever i wwanted to buy a lens, used or even new. After my 24-105 flared flat in my face, i wanted to throw rocks at them.
On the quieter side, my nikons have been serving me well, using the F bodies from my grandfather, father, and now me, with a beat up F5 with over 800 rolls of film through, and a D2h that doens't seem to want to die. As for lenses... Nikon doesn't have that much of a selection compared to canon, (mkI,II,III,etc)but hey... they don't need to.