Only a couple of points, the Sabertooth mobo is a great board but I think you would do better with the Asus P8P67.Read this review. Mobo Review and the other point I would like to make is that you would be better off with a OCZ Vertex 2 Series 60 GB SSD, which is something I have, I have my OS and about 70 programs (all games etc go on my 1TB drive, with around 18GB's left. So I think you will fill up the 40GB SSD quite quickly. I would also up your ram by 2GB.
I have been building for a while now, just about to start on a HTPC this weekend, so any questions do not hesitate to ask.