at the moment, I am holding the money and thinking about the two mac pros. One is 2.9 4-core, and 2.26 8-core, these two are similar price. I dont know which one to go, could you guys give me some advice? I am currently using a 24 inch imac， 2.4 Ghz core 2. I fund it is not enough for me, I want to do some photo editing, use some engineering softwares and watch Full HD movies. Thanks!