Hi, my mom wants to get a computer, so I can either give her my p4 1.5 ghz with a ti4600 and get a mac or she can get a new computer. At first I was looking at the 2.5 ghz G5 with the educational discount, but it is still a little pricey. How much faster is this G5 than the refurbished old model 2.0 Ghz G5 (with the 9600 pro). That one is only $2000 which seems like it is a steal. I mean will moving around the os feel more responvie on the 2.5 Ghz. Also are both going to be faster than my current pc?