MSI Afterburner is probably all you really need. Allows you to mess around with all the different core speeds and fan temps to ensure a nice overclock. You can also get HWMonitor, but thats more of a voltage/wattage/temperature monitoring for all components.
Yeah, Afterburner is all you need. It has everything all in one place.
You'll also want to decide which of the Nvidia driver components you want to install. At a minimum, you need the graphics driver and the PhysX software. After that, only install those components you need/want. HD Audio, 3D Vision, and Nvidia Update are optional unless you use those, for example. There is also the option to install Geforce Experience, which configures your game settings automatically based on your hardware configuration, if you wanted to try that out.