xsi, you pay a premium because it's brand new and has a lot of new features [like live view and spot metering]
between nikon and canon, you really cant go wrong.
what type of photography you want to get into though?
canon builds certain lenses better than nikon, and vice versa.
for instance, i think canon's telephoto lenses rock nikon's
but nikon has an external flash system that canon can only dream of
When you say it has a better flash system, how so? Do the flashes have more power output compared to Canon's?
BTW. Just played with an XSI and I'm pretty impressed. Live view is different from the 40d's in that you can choose to autofocus without the mirror flipping back down and up. I like the grip and over all shape of the body. Has a more pro look to it. Plus, the kit lens is really good. Took some pics with my memory card inside, and uploaded them to my computer. Noise performance is really good almost as good as the 40d though maybe it's because of heavier noise reduction going on inside the camera as some areas tend to get muddy.




















