Hi. I am in A.P. Calculus in high school right now and I am shopping for a graphing calculator. I want one that can do everything! The price is not an issue. I want the graphing calculator to do super well on graphing, derivatives, intergrals, and everything else in Calculus and more! Even stuff I don't know about yet. I also want it to be able to scroll back up and reenter places on already written out problems. Most graphing calculators don't do this automatically like the cheap $20 TI x^2 ones and it drives me crazy! I want the best of the best; one that will last me for 4 years of hard schooling. Is there such a calculator that exists? Please let me know! And fear not me cheating. I have received nothing but straight A+'s for these past two years (Pre-Calculus and A.P. Calculus) in every 9-week period and semester exam; I can handle anything. Thanks for your help!