From what I've researched, the 10D is one of the heavier SLR bodies made due to the magnesium body construction.... the body with battery alone weighs 870g, compare with the Nikon D3000 body with battery which weighs in at 536g.
Most brands use magnesium bodies (or something similar) in their upper tiered models for durability. Your 10D as well as its later siblings (20D, 30D, 50D, etc) all constructed in the same manner. This is true for the higher models within the Nikon line. The Nikon D3000 is pitched at the consumer line (Rebel XS is the Canon competitor) which are usually made of plastic bodies for lower cost. Given your budget, I would consider keeping the lenses you use with the 10D and purchase a Canon Rebel body (the latest version you can fit in your budget). Switching systems at this time is going to be prohibitively expensive.
The best camera I can get (body only) in the Rebel line would be the XS.... $400 on ebay, and I'm still stuck with my lens that doesn't really serve my purposes. Is the Rebel XS much better than the Nikon D3000 which I can get lens and all for $400? Maybe there's something I don't know that makes the XS a lot better than the D3000? The specs appear to be fairly comparable... but with the XS I wouldn't have the VR lens, and the display is .5" smaller. Otherwise they seem to be very similar. And of course if I'm not selling the lens I have, just the body, I can't expect to get as much, so I'm coming out behind on my budget if I spend the full $400 on just a camera body...
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