The majority of Canon cameras are quite reliable in most respects. Though I must say, I don't believe the XT1i exists... maybe you mean the XTi, or the T1i, or maybe some lovechild of theirs that I am unaware of.


Either way, I shot with an XTi for quite a while and it never really gave me any troubles. I will say it isn't quite a modern camera and things have improved greatly since its release, most noticeably in the low-light department. There is nothing wrong with getting a Rebel because they aren't terrible by any means, and you may even snag a lens with one.


I will recommend though, from my experience that you have a look for something like a used 40D or something. Stepping up to the X0D line will get you a camera with a little more heft to it, better construction, likely better features, and a long lasting shutter. I would head out to a local camera store and have a feel of either model, be it a rebel or a X0D. To me, the larger bodies just fit better and being comfortable with your "tool" is very important.


Most importantly remember this, it is not the camera that makes the picture, it is the photographer. There were plenty of professional photographers making amazing images with digital cameras much much crappier than anything we see in todays market. Just get something that works for you and learn how to use it to the best of your ability and I promise you will be happy with it.