um, being a noob, i probably shouldnt stick my nose in on this one, but i have to vote for the canons.
Now please take this as its ment, light hearted, i'm not flaming or berating anyone, just stating my personal beliefs and experience....and in my experience, moving from one mount to another is as easy as getting an adapter, which just so happens to double my lenses anyway, so i can get away with a smaller lens, and still get thoes tele shots like from a larger, heavier, and much more expensive lense.
I've had the same set of lenses now for over 15 years, never had a problem with them, just moved from body to body(i have a tendency to wear them out beond repairability(money wise vs getting a new body)
i burned up 2 35mm rebels, a couple others, and now i'm on my first real DSLR and as of right now, no signs of problems, and i'm still using thoes same old lenses.
oh, and about the changing of mounts, at least canon is trying to improve, and before you say it, nikon mounts arent bad, but they could use some updating, so don't say that they got it right from the start. I mean this is a salt water forum, we all know you never get it 100% perfectly correct the first time at everything. Right?
oh, and BTW, d2mini, thats a damn fine shot!