Its going to be hard to find an un-biased opinion. Reason being is simply because people who use Nikon will probably say Nikon and people who use Canon will say Canon. My best bit of advice would be to just try to go lenses are somewhat cheaper, but that is probably me just be biased because I use Canon. My appologies if that didn't help, best of luck.
If you buy a Canon system, you'll stick to the Canonians (ME! :gbounce
If you buy a Nikon system, you'll stick to the Nikonians.
As the others have said, you won't go wrong with both cameras and systems. It all depends on what you really want. Both systems have their pros and cons but the only way to really find out is to go to a camera shop and try both cameras out. Some say they don't like the Canon 300D's feel because it is plasticky but really, it doesn't matter because the plastic isn't involved in the picture taking process.
Honeestly, as I have said before go try both cameras out and you'll know which side you'd prefer