I wouldn't dismiss Nikon, just think you've just been very unlucky.
Gen. Lee wrote 'The shutter is only rated to about 100,000 exposures' that's the same as the 5d.and more than the 20d I think! So remarkable value. Agree with Gen. Lee that they are 'throw away' cameras but not sure what digital cameras aren't at the moment. Canons two pro-bodies (1DMk2N and 1DSMk2) shutters will last 250k actuations, perhaps 2-3 years pro-use by which time it's time to upgrade anyway.
Not knocking Canon as I use both......Just some thoughts.......