Does the PowerLogix CPU card come with extra fan? If not, do install one in the bottom, there's ready made place for it already, just steal the power from using Y-cable from optical drive i.e. For more details check http://www.cubeowners.com and instructions http://homepage.mac.com/tracer302/bluecube/PhotoAlbum24.html.

Your Cube will be awesome with SSD and prosessor upgrade!