Storage: You can install Windows and software on the SSD so that they run faster and put the rest of the data on the 1 TB drive. But it's important you tell your family to save their files, pictures, music, etc... on the 1 TB drive. Otherwise the SSD will fill up fast. What I would do is map some of the Users folders to the 1 TB drive (like "My Documents", "Desktop", "Pictures", "Music", etc...) so that it saves automatically on the 1 TB drive.
Totally agree with Mysteryos about getting a new monitor. Having such a powerful PC and playing on a crappy 17" monitor doesn't make sense. You'll see, gaming on a Full HD 24" monitor will be a real treat.