yes i would agree with above setup, but if your looking for some extra performance, being your small drive is only to run os why dont you get an 80gb solid state drive that will make your boot quicker, you can get an 80gb for around £150, then get a western digital 500gb internal hard drive, and a 500gb external drive that way your files are backed up to two seperate drives, and you have the external you can easily plug into anything else, say for example your giving a friend some files etc.