To stay within your price range, I would go with the Rebel. You won't be disappointed. For a tripod I would recommend the Manfrotto 3021 Pro w/ the 488RC2 ballhead. I think both can be had from B&H for around $300. It is a very solid tripod, a little on the heavy side, but that isn't a bad thing unless you plan to do a lot of hiking with it. If money is no object go with a carbon fiber set of legs. The 3021Pro is a very solid, stable tripod that will serve you for many years.
Get the Rebel for $900, the two lenses for another $900, tripod for $300, a decent flash for a few hundred, memory cards (a couple smaller ones are better than one large one, that way you don't lose as many photo's when a card goes bad). You will also want an off-camera flash cord for taking tank shots. This cord screws into the camera hotshoe, and the flash screws into it. It allows you to hold the flash in your hand off to the side a little bit, that way you don't get those annoying flash reflections from the tank glass. You will also want extra rechargeables for the camera.
The Rebel XT is a decent camera, and you will be more than happy with it. If you want to shoot action sports such as motocross, car racing, etc, then you should go with the 20D as it has a better AI Servo system.
And yes, that link you have above is for the 20D. I have it, love it, want another.