I never know about those PSU calculator sites. I've seen situations where the values they provide do not match up with actual configurations. As far as what video card to get, I look at what programs I want to be running and what their minimum requirement is. Then just pick something that is above that (or the recommended) in whatever price range I am willing to pay. That and (for me at least) I will always get one with a fan on it. For PSU, if the video card you are looking at does not list a PSU requirement (some vendors do not publish this info online, such as MSI) then its hard to tell. Oddly enough, that requirement will be on the video card box. Another thing to go on is what the board itself is looking for. The Technical Product Specification for your board shows the following: Personally, I've not used a sub 400W PSU since 2000.