I would also change out your HD - I am not a huge fan of Hitachi HDs as I've had way too many of them fail really easily on me over the last few years. Maybe go with a 64GB Crucial M4 for your boot drive and then get a Seagate 1 or 2TB HD for your secondary storage. In a build for what you need it to do you should *FOR SURE* have your OS separate from your data in case you ever need to reformat.
HDD*: I've used seagate drives with success, just make sure you have sufficient cooling for the drives.
PSU: Either one works just fine.
EVGA is good, but if you have MSI TwinFrozr models available at a reasonable price, they are very nice as well. They have great cooling and are much quieter than the more or less standard models that EVGA has.
As you can see in the Memory Specifications section, the CPU supports DDR3-1066/1333 Mhz but the memory I presented is 1600 Mhz.
1. Will they work together? Meaning, the CPU will limit the memory to only 1333 Mhz but will work fine, right?
2. I'm asking this so I can upgrade the CPU to 1600 Mhz in a few years.
Is that a valid consideration or should I just downgrade the memory / upgrade the CPU ?
They work together, the Z68 motherboard you selected will allow you to run the memory at 1600mhz. The CPU frequency and memory frequency are not tied together as much as they used to be so you will be fine with your selection.
What do you think of my choice? I'd love to hear it's shortcomings.
I've used and formatted tons of drives and I've had the best luck with Western Digital and Seagate, the worst with Hitachi. Seagate makes some excellent drives and they last a long time. The Western Digital Caviar Black is widely regarded as the best right now but you will be paying a huge premium for them due to the HD shortages.
You should also heavily consider an SSD for your boot drive - you don't want to have your data and OS stored on the same drive in case you need to reformat or clean out Windows.
The Seasonic one is half the price for me, does it measure up to the Antec one?
Seasonic is widely regarded as one of the best on the market and actually is the OEM manufacturer on a lot of Antec, XFX, and Corsair PSUs.
I don't know EVGA, are they any good?
Yes - they are pretty much all I buy for NVIDIA cards - they have an excellent tech support and RMA department if something goes wrong.