Apologies, but it looks as if I posted this in the wrong category at first and didn't follow the advice in the sticky, so let me try again (I'm new here).
Approximate Purchase Date: next few months
Budget Range: $500-$800
System Usage from Most to Least Important: HTPC, media server, gaming (e.g. Team Fortress 2, Portal 2, perhaps stretching to newer titles like Modern Warfare 3, Bioshock 2, and Starcraft 2)
Are you buying a monitor: Will be driving a 1080p projector on a large screen
Parts to Upgrade: NA
Do you need to buy OS: No
Preferred Website(s) for Parts: Amazon, newegg
Location: Fairfax County, VA, USA
Parts Preferences: none
SLI or Crossfire: Doesn't matter
Your Monitor Resolution: 1920x1080
-Needs to have 5.1 sound.
-A near silent rig is very important, however, I'm willing to trade for some additional noise if it's going to get me significant savings.
-I have spare HDDs for main storage, but I want speedy boot times, as the machine will not be left on all the time; an SSD is a must. Again, I'm willing to spend on the upper end of the range if I can fit the games on the SSD so that they start quickly.
And Most Importantly, Why Are You Upgrading: I'm building a home theater.
1) Sorry, I see that I was being too vague. In the parts list that I linked to in my original post, I had a similar Seasonic power supply, but it was 60W less (400 vs the 460 you suggested) and also $20 cheaper. As I said, it's a small price difference, so I'm probably being too picky, but $20 here and there can make a pretty large difference on the final price. I was wondering whether I would realistically ever need the extra 60W of power anyway.
2) This is really awesome to know, so I'm very happy that you pointed all of this out. Thanks again for all of your input.