Will 700w be enough? I've tried Calcs @ journeysystems.com , http://www.extreme.outervision.com/PSUEngine, as well as a couple others, I think the journey one is outdated or very minimal estimates. I have the 850w in the saved build at the moment, but if I can get away (safely) with the 700 it would save a few bucks that could round out the build a bit more for me budget wise.
Get a SATA burner, not IDE. Samsung SH-S203B, for example.
If you need a data hard disk I recommend WD7500AAKS.
The fans you picked move 64 cfm at 30dB. Scythe S-Flex SFF21E moves 49cfm at 20 dB. That is, you still get more than enough cooling with 10 dB less. 20dB means exactly half the noise compared to 30dB, that's how the human ear works. Also, you could save some cash with CoolerMaster RC-690 instead of the Stacker.