Ron,
Another option, I would suggest, is going down the full-frame route. Your Rebel is a crop-sensor camera which means its view of the world is constrained by its sensor. The result is cropped images where a potential panorama is limited by a factor of 1.6 (a 10-20mm lens therefore becomes a 16-32mm, if my sums are correct).
Full-frame cameras not only offer a wider field of view, but because their sensors are bigger and made up of larger sensory receptors they produce much better images. The downside is they’re a lot more expensive than entry models like the Rebel. That said, camera technology is developing at such a pace that many pros are being forced to ditch their perfectly adequate full-frame cameras to keep up in the megapixel race. This means there’s a healthy second-hand market at the moment where you can pick up a Canon 5D for about £700.
Hope this helps.