Optical: You're paying well over twice what you should for a DVD burner. Find the cheapest SATA drive on Newegg (I think the current one is a Samsung for $21 with $2 shipping). This part makes absolutely no difference in the build, so just go with the absolute cheapest one.
Case: The HAF 922 is the same case, just slightly smaller and a lot cheaper.
GPU: Depending on your resolution, the 5870 may be worth it. If it's 1900x, you should probably upgrade.
PSU: Assuming you're upgrading the GPU, here's a money saver: OCZ StealthXStream 700W. It's in a combo with the HAF 922 for $130 after rebates. That'd save you a good $120.
The HAF 922 could save you a bit, but I would stick with the Corsair PSU if you plan on Crossfire down the road. The OCZ one in the combo with the HAF 922 is OK, but it doesn't have enough power connectors to do Crossfire with 58xx series cards. I despise those stupid adapters, so I just buy a PSU with all the connectors I'll need. Another option is to go with this combo: