Peripherals: for now disregard but i'm looking at razer's deathstalker
Future computer: mostly gaming :) i'd like it to last like 8+ years with possible upgrades
Overclock/Watercooling: not looking to overclock or use a custom watercooling
OS: don't need one as of yet
Gaming:
Prefer high and/or consistent FPS on high graphics. I'll give my pc leaveway for crysis and etc.
I'm likely to play on a 21 inch screen, so I guess approx 1920 x 1680
Games will generally include BF4, crysis, most of the fun latest games. I most commonly play LoL atm but well, that's mostly because of my limitations of my current laptop.
Other preferred requirements:
I am picky about noise. I'd really like a fast gaming rig that is really quiet.
From what I've heard the WD greens are rubbish, I'd suggest picking up at least a blue or a Seagate barracuda. Also I would suggest an i5 for gaming, perhaps consider a 4670k on a z87 motherboard.
I don't plan on overclocking so I don't see the real need for a K-type core or Z-type motherboard. I also may want to add another graphics card. I heard that an i5 can't support 2 graphic cards.
EDIT: I'll take a look at your HDD suggestions. I heard that seagate had issues before though: related to data loss.
take a look at the samsung 840 pro 128GB. The SSD is where you will want to install whatever programs and games you use/play most as well. I know it seems pricey for the space you get, but it is more than worth it.
An SSD will make your whole system more responsive. Your fps won't really increase, but loading gets much faster and this is a big deal in games like Skyrim.
Also, with an HDD my computers would always get slower over time as it filled up, but this doesn't happen so much with an SSD as long as TRIM is enabled.
An i5 can support however many graphics cards your motherboard can. The motherboard in you list supports 2. Also, I just want to say 8 years is a VERY long time if you don't upgrade your motherboard and CPU.