I suggest the following changes.http://www.newegg.co...N82E16811119137
It's diffferent from the Antec900, but better. I have the Antec900 and have fought with it for a while. The CM690, has hard drives swaped 90* for easy access and doesn't collect nearly as much dust. I'd recommend this case over the Antec900 anyday. Also, you can add more fans to it if you want better airflow.
As far as the PSU goes, it's over kill for your build, big time. I suggest the one below, it's cheaper, but just as good in terms of build quality.http://www.newegg.co...N82E16817139004
As far as your optical drive goes, again there is better out there for less money. I strongly suggest one of the models below.http://www.newegg.co...N82E16827151153
I have the pioneer drive and I plan on purchasing the Samsung soon.
As far as the CPU goes, I'd suggest the E8400, but you'd have to wait a while. Intel is having yield problems and there is HUGE demand for this part, together making the perfect storm.