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Mike is on the money with his recommendation, the Sigma 17-70 is an excellent lens for the money as is the 400D. Your existing film lenses will fit, provided they are EF mount, but for example the sigma 17-70 (an EF "S" lens; EF-S stands for Short back focus) lens won't fit a full frame SLR or full frame DSLR camera (eg EOS5d), because the rear element protrudes further in to the camera and the mirror won't clear. The mirror on a 2/3 sensor camera such as the 400D is smaller and will clear the specially designed EF-S lenses. If you're curious as to why the lenses are designed to protrude further in to the body the main reason is to get the light path as perpendicular to the sensor as possible. Your existing lenses will have a magnification factor of 1.6x on a DSLR; i.e. a 28mm lens on a 400D will have a FOV the same as a 45mm lens would on your film SLR, a 17mm on a 400D will have the same FOV as a 28mm on your old camera. Modern DSLR lenses also have to have much better anti reflective coatings as reflection off the sensor and lens elements is more pronounced.
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