I'd go with the EOS 20D. The Nikon D70 is a great camera, but more competition for the Rebel XT. The 20D is better than both.
You'll want to be more specific about what you need the lens to do. For scenery you'll usually want a relatively wide angle, for sports, especially motorsports you'll want a long fast lens. Then, major importance is what price range, $200, $500, $1000, $1500??
Most camera people will tell you get a good body and the best 'glass' (lenses) that you can. For the Canon the best are the Canon L lenses, but they are mighty expensive.
In lenses budget is really the most important thing. How much do you have to spend, once that's established then what do you need to do. Then you pick the best lenses that you can afford that do what you need.
Here's a good article recommending lenses for EOS cameras
http://bobatkins.photo.net/photography/digital/10d300dlenses.html
If you want a site like Pelican, but for Canon cameras go here,
http://photography-on-the.net/forum/
There's a lens section and several threads asking "which lens should I get?"
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Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten