Gaming computer help please

Im looking to buy a new gaming desktop and will mainly be playing WoW and LoL but also enjoy fps' like CS:S and some other classics. Can anyone tell me what wil get the job done without spending 4k dollars. I would like to have a little over the minimum and room to handle some other games. I looked on some websites but they make it so confusing and I don't wanna get ripped off. Mainly I need help finding the right motherboard, graphics card, processor, and what tower housing to get (Aswell as fan or liquid cooling)