Hi GrimCamera welcome to the forum.
How good is the discount you are getting? I did a quick search on Amazon and found the Canon Rebel T3i on Amazon
for $563.70 so my advice would be to shop around and see what you can get.
As for the two cameras I don't know either model but maybe others can help you there. Have you been to a store and held these cameras to see which one feels best in your hands?
Tripods use a standard size screw so any tripod would fit in there. Note that if you buy the legs and tripod head separate that the camera won't fit on the legs itself.
I hope this information is helpful to you.