What's the best smartphone/handheld for school?

well they have these flip phones that have a qwerty keyboard on them, so u can have the convenience of the keyboard, and the small size of a flip phone. i have a cell[RIZR] along with a dell pda-im a junior. i find this most convenient b/c if i dont need my pda, i dont need to carry a huge phone with me. most flip phones have a planner in the anyway.