Andrew, building your own is fun and not terribly difficult. I built my first a bit over a year ago, and my
second several months ago. It is great learning experience, it's enjoyable and rewarding, and it's
something that Mac people can't do :-p
Here's some specific comments: Intel boards used to be considered the rock of stability. Not so much
any more. I recently used an Asus P5K-PRO, which is a great board with firewire, many USB ports, IDE
support, etc. That's one version back though ... the current design is P5Q-PRO. A "retail" packaged
motherboard should come with all the cables you need to connect the headers (on the motherboard) to
the case connections.
If you buy a "retail" processor, it comes with a factory heatsink/fan. No need for a different one unless
you are overclocking. In fact, using a different one technically voids the warranty.
For a video board, ATI are much preferred over Nvidia. It is considered stronger with 2D (meaning
Photoshop) use. The 3850/3870 are quite reasonably priced these days and perform admirably.
The key to selecting memory is choosing RAM whose voltage and latency is supported by the selected
motherboard. You can find specs for the motherboard and RAM on the manufacturer's web sites.
10k RPM drives are favored by video editors and serious gamers. A Seagate 7200.11 or your chosen
size will be a great performer, it has a larger cache (32MB) than any of the other makes. SATA is the
choice of format.
Optical: I haven't used Sony. I've had fine luck with NEC, Samsung, and Asus opticals. They're so
cheap, I simply put one DVD-ROM in ($20) and one DVD-RW ($30).
It isn't a bad idea to have a floppy on hand. Some diagnostics and some driver installations still rely on
floppy. You can get external ones, or you can pick up an internal one (less than $10) and just have it on
hand *in case*. Only mount it in the case if you need to.
Antecs are well regarded and high quality. I personally like to choose a power supply separately, as I
can pick one with the exact specs, shop around, etc. Corsair are great units, PC Power and Cooling,
Seasonic. The one in the Antec case is fine I"m sure, and 500W is plenty for what you're putting in it. I
like to choose an 80+ certified PSU because they are the more efficient units. Meaning, the PSU is not
wasting energy by creating heat ... it's using electricity to convert electricity.
Get a decent surge suppressor/UPS.
Monitor/keyboard/mouse or tablet.