I use a Canon 1Ds MkII and Canon 20D's as back ups. They've never failed. There's a good range of lens and accessories, with good servicing.
Although I use Canon, Nikon are also great cameras. I would say, see if you can have a go with both, then pick the one that 'You' prefer.
I'm happy to answer any questions on Canon gear. www.shanekennyphotography.co.uk