To find out what CPU you have the easiest method is to download and install CPU-Z.
Incorrect. The easiest way to find this information is not by downloading something. Right-Click "My Computer" (Windows XP) or "Computer" (Windows Vista/7) and Choose Properties. Your Processor information is listed in System Information. Shortcut: Windows Key + Pause Break.
Magenta is for the Top 3 recommend CPU's, based on Price/Performance/Power Consumption/Platform/Overall quality. I'm an AMD fan. These are merely the facts.
I'm going to have to disagree, my Phenom II x4 940 smokes the Core i3 and i5 on your list on stock settings, let alone I have overclocked it to a 965 BE.