Would get a 2x4gb RAM kit instead for dual-channel.
Also, the Antec Three Hundred Two instead. Cheaper, more modern.
550w would be more than plenty for a single GPU setup. If you're going to Crossfire in the future, up it to a 750w.
All in all, I would rate the build a 9/10.
Oh and, a cheaper optical drive would perform just the same. Also, get one with no shipping cost.