Moderators, please move this to the "New Builds" section.
Shattaken, an HTPC is a Home Theater PC--typically something quiet with low power consumption and a weak CPU/Graphics card that is only good enough to play 1080p 3D video well. What you're asking for is a 3D Rendering/Animation machine so you'll want to change your title to attract the right people and perhaps include your budget. Something like "Budget 3D Rendering $800 for remaining parts".
You'll also want to include CPU & motherboard in "Parts Not Required".
You say that the "Preferred Website(s) for Parts: doesn't really matter", but I don't know what places ship to Antigua. Could you provide a list of places you can buy from? Because there's no point in us naming something on Newegg.com only to find out that you can't get it.
Overclocking: You can start another thread on that sometime. If you don't overclock, the stock cooler will be adequate.
What power supply did you buy already? I won't trust it unless it's Antec, Corsair, Seasonic, or XFX (there are a few more less common and more expensive brands that are high quality).
Also, don't worry about "future proofing". It doesn't work. All you can do is make sure that the parts you buy aren't outdated to start.
So you have $800 to spend on:
Case
Memory
Cooler
SSD
Case: You want fan filters, USB 3.0, tool-less design, and, if your SSD didn't come with a 2.5" to 3.5" adapter bay, a 2.5" bay.
Memory: I've never heard of Komputerbay. I'd stick to G. Skill, Kingston, Corsair, Mushkin, or Geil. You have the right idea with 4 sticks or 8 sticks of 1600CL9. If I were you, I'd go with 32GB (4x8GB) by getting two sets of something like this:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
If you want to go with 4GB sticks though, this Kingston is a similar price to the Komputerbay stuff:
http://www.amazon.com/Kingston-Technology-Modules-KHX16...
I added an SSD in there because they're so cheap right now there's no reason not to include them in a new computer that's not on a crazy cheap budget.
Cooler:
You don't need one until you overclock. When you do, know that low end water cooling (like the H80) doesn't do better than high-end air. But it does take up less space and sound really cool if bragging. The H80 isn't bad at all though.
SSD:
I say get a 120GB on sale for $100 or so. Stick to SATA III. You can go Sandforce for speed or Marvel for reliability. Take your pick.