I have a Canon EOS Rebel T2i. In the view screen I have a icon that is flashing with EXP.Sim what does this mean? I have looked through all my books and can't find an explanation.

I am looking at upgrading my Camera I have a small digital and a Canon AE-1 programable. I am currently looking at the Fugifilm HS20EXR 16MP and the Canon EOS Rebel T2i 18 MP. I can get fairly good deal on either at the base exchange. Which would be best for taking pictures of family, friends, and outdoor shots like landscapes, flowers and wildlife.