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The Canon kit lenses, as they come with the Rebels, are, as I repeatedly read, garbage. You have to go to the next level of Canon lenses, which will make it expensive.
Depends on the lens. I still use the 18-55mm EF-S lens that came with my 300D on occasion. Yeh, the build quality is dodgy as hell, but the lens is optically superior and produces tack sharp images. You're just scared to touch the poor thing in case it falls apart.
My 17-85mm EF-S that came with my 20D has good build quality, for the most part, but the optics could be better. It's softer at the edges than it should be and the vignetting is awful at the wide end of the zoom (even after you stop down a bit).
I've since sworn off anything but L glass.
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(Canons have been known for poor ergonomic design and cheap plasticy feel - at least regarding the rebels, which also haven't been updated in a while).
My Rebel definitely feels cheap. The 20D less so, but Canon screwed up in three major areas with the camera:
1. The battery grip has a habit of coming unfastened from the camera. I finally got so pissed off with this that I used denture adhesive to mount the grip -- it feels a lot more solid now.
2. The CF card door isn't integrated into the design properly and makes the grip feel cheap. It also squeaks when you squeeze the camera.
3. The mirror slap on this thing is so loud that it scares of wildlife at 500 meters. It sounds less like a camera and more or like a linebacker making a tackle. You'd think it would have been quiter than the 10D, not louder.
The 30D body has a better heft than the 20D, but you can still make the battery door squeak if you grip the camera enthusiastically. The shutter is quieter now and I'm told that the battery grip is not prone to falling off. You may want to have some denture adhesive handy if you buy a 30D just in case, however.
HTH