TI-86 scientific calculators are the best. Well (trust me) just said that he was very happy with the Various functions of his Casio MS 8l. But I tell u Texas Instruments(TI-86) is so advanced it has all the functions like vector calculation, assigning variables value and even you can draw a graph in its screen which is so cool it just looks like a palm top. It has so advanced feature like downloading new and new formulas from the net. Well if someone is looking for a scientific calculator then it the best you can get. Of course because it has all features it has to be expensive. Now that’s the case with every scientific Calculator.