Why not to get this combo...
1) ROSEWILL PSU... Not recommended!!! It will put your system at risk!
2) Cas9 RAM vs Cas7 RAM... The OP's RAM will perform better due to the tighter timings on Cas7
Overall, The OP has built a nice system. Just make sure to double check combos for additional savings. You haven't listed an OS but I would pick up either Windows 7 Home 64-bit or Pro 64-bit for your OS.
Everything in your build will work together. Looks like you might be able to switch to an LG drive a save few dollars though. Internally many LG products are the exact same as their more expensive brother Plextor. Check out this article: