Please post using the following format found in this link: http://www.tomshardware.com/forum/261222-31-build-advice
-After you filled out that and given the details, we'll discuss what parts are best for you, and when you say you run trading, be specific on what software you use, what are your expectations of this new PC, and how this software currently runs the on the PC you are using now. BE VERY SPECIFIC.
Also, go to this link: http://www.tomshardware.com/forum/forum-31.html
^^^^^Look at the Sticky posts at the top of that forum section, there are six of them and they are bold letters, read through all of them, they are great guides about homebuilding a PC.