I've been through a lot of Sonys.. Not a very reliable unit at all. I'm very unsatisfied with them. Interestingly enough, I have a Sony Vaio machine sitting here beside me, one of their top end models actually.. and guess what? It has a Pioneer DVD/RW in it (that's the unit Sony provides). I guess they don't even believe in their own drives.
Antec 900.. It's very poorly designed inside. Once it's together it does a good job of cooling, but if you're a tinkerer like I am, that case is most definitely a very bad choice. The Thermaltake or even one of the other Antec models would be a better choice.