you do know that the 500D is also a motorless body right?
Yes, well that's a good thing, since EF & EF-S lenses have built-in AF motors
MelbourneGuy, I'm glad you're going to get hands-on experience with the D90.
IMHO, the main differences between the 2 systems are more in their handling philosophies -- how the controls are arranged, which controls are easier to access, that kind of thing. It may sound strange when Ken Rockwell compared lens cap design, but it's this kind of niggling little details that can sometimes drive you crazy. Perhaps not lens cap design per se, but you know what I mean.
I prefer (and use) Canons, but there are some things about the system that I hate e.g. the exposure lock system. I also prefer the way Nikon places the main power switch concentric with the shutter release. On the whole though I prefer the way the Canon handles. I guess you'll have to decide which features and which 'shortcomings' you can live with and which you cannot. Neither system is perfect.
One other possibility you may want to consider before committing to a system -- buy a used set and try it out for a while. Perhaps a one-generation old model (Canon 450D/Nikon D80) with a standard zoom (18-55). If you find you don't like the way it handles, you can sell it off w/o losing as much as with a new body and lens.
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