The Corsair HX650 is a good choice for almost any build, especially in your case. 650 watts is a good size to allow some breathing room, you could go with something like a 450w, but you'd probably be running at close to max wattage during heavy tasks, and you wouldn't have any room to upgrade. It's also modular and is 80+ Bronze certified. At the price of $130 USD (http://goo.gl/ID0CU) it would be a very good choice for your purposes.