My Mac Pro is a few years old and has the specs listed below. I am starting to get into more video editing using Premiere Pro CS4 and After Effects CS4 and the Mac Pro is running a little slower than I would like. What are the best things to upgrade? Current Specs: OS Version: 10.4.11 2 x 2.66 GHz Dual-Core Intel Xeon 4 GB 667 MHz DDR2 FB-DIMM NVIDIA GeForce 7300 GT 256 MB Seagate Barracuda: ST3500630AS I was probably going to upgrade to Snow Leopard and put a few more sticks of ram in it, but I am not sure if this would be the best upgrade choices. Can someone please suggest the best options to get the most out of this mac pro with a $300 budget? Thanks!