TBG got me thinking--Help Me Build a Desktop

[doomy3]

Well, TBG got me thinking with his thread, and so I want to build a desktop. I have never done this before and have always just bought a computer in a B&M store. I don't play any games, so it doesn't need to be able to do that. Here is what I need it for:

-Browsing the internet--want it to be fast

-Basic document applications like Microsoft Office, etc.

-Photoshop photo editing

-POSSIBLY some video editing

-Needs to work on a dual monitor setup

-Needs to work with the following parts, which I have already bought:

LITE-ON Black SATA Model iHAS124-04 CD/DVD Burners (RW Drives)

SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM SATA 3.0Gb/s Hard Drive

I also already have Windows 7 Home Premium 64 bit that I will be installing.

I do have a Microcenter close, so I would be able to buy there if it makes sense, or Newegg or any other retailer. Would like to keep the amount around $400 if possible since I already have the Hard Drive and DVD Burner.

Thanks for any help or suggestions on a build!