I'm trying to upgrade an old computer to improve it's performance. I'm currently running an AMD Sepron LE-1100 CPU on my Foxconn 761MX, but want something that is going to provide better performance. The LE-1100 keeps maxing out CPU usage while I'm working. I don't use it for anything too complicated: films, music, software like Quark Xpress and Scrivener. I shall be upgrading the RAM as it's currently a little low, but was hoping for some advice on the best CPU.