Right now I have a Ti-86 and want to upgrade to a graphing calculator that has more functions and also more powerful. I'm split between the Ti-89 and the HP 48GX. I'm currently studying civil engineering in college, so which ever one is better suited for the engineering field and college mathematics is the way to go. That's where I need your guys' help. If anyone has had any experience using either the Ti-89 or HP4 8GX, I would really appreciate your input as to how well the calculator performs, ease of operations, and your opinions about it. Feel free to post any comments about the subject matter.

Ti-89

http://education.ti.com/us/student/prod ... /ti89.html

HP 48GX

http://hpshopping.speedera.net/www.shop ... /48gx.html