I'd drop the Caviar Blue and go for the Samsung Spinpoint F3 1 TB. It's faster. Other than that, the build looks pretty good.
EDIT: Just to be sure, what's your budget? Is this build right at your budget limit?
my budget is approx $1200 australian dollars,i have gone a bit over budget but thats ok,its better to get good hardware i think,even if it costs a bit more..i will take a look at the samsung HD..thanks