What is the best overall graphing calculator for High school?

i will be going into algebra II honors. i've been reading into a lot of calculators and apparently the TI's are the best. I also read up on the Casio FX-9750GPlus and it also sounds good and its very reasonably priced. which TI calculator do you recommend for a sophmore going into algebra 2 honors? should i get a casio? I am going to purchase it on ebay so they are all pretty much the same price.