I am wondering about something- the guys in the mathlab at school told me that the 85 was a stronger package for engr, while the 92 was a better calc for calculus. I am currently using a 85 and want to upgrade, any reccomendations as to 86 or 89? (the 92 is out, I carry my calc in my back pocket) Also, I want to buy a Graph Link. Are there different ones for each calc, or if I get one for my 85 will it work for all the others? Thanks