Well,
For Studio, all you really need is a basic system. You will never find a machine that edits as fast as we can. For all the software you listed, you would do well with the the best CPU you can afford, a mid-to-high end ASUS Motherboard, Either Nvidia or ATI cards will work, as those programs aren't really GPU intensive, but Nvidia with its CUDA processing is an excellent choice, as this offloads some of the work to the GPU and speeds rendering time, something ATI cards don't have. I would recommend any of the GTX4xx series cards, as the 5xx series is having some bumps right now. The bigger the number, the more CUDA cores, the faster the work gets through.
Here is the models of the parts I recommend:
Motherboard:
ASUS M4N75TD, as this board is a tried and true, bulletproof board that still works great, and the Nforce 700 chipset is one of the good ones. $99
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131637
CPU:
AMD 1090T. You don't need to spend big for what you want to do, so Intel is not really needed for this. The 6 core 1090T works great for basic video rendering, as I too do this and am amazed at the performance. $199 (or go to the 1100T for $239)
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103849
Memory:
If you really want to go with 16GB (which I would say is overkill, not to mention expensive), your best bet would be to shop around for a great deal. 4GB sticks are not cheap. I would recommend 8GB of OCZ or G-Skill. You will have to check your QVL for the motherboard you choose for compatibility. Looking at anywhere from $60-250 depending on type used.
Video Card:
If you want a good card that will last, get a Nvidia GTX470 or GTX480, or you could go big and nab a 570 or 580, but these will be around for a while, the 400 series are dropping in price to get rid of stock and they are just as good as the newest cards. I have 2 GTX480's in SLI and there ain't nothing out there in the video game world that can even phase these cards at max graphics settings, plus they speed up render time for Windows Live Movie Maker. You don't need to spend $2,000 on a tesla line card for home projects. GTX480 $459 (prices vary depending on manufacturer and place of purchase...example is of a Superclocked version)
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130558
PSU:
Thermaltake TR2 W0388RU 600 watt should suffice. I've used Thermaltake for years, and never a problem. $69
http://www.newegg.com/Product/Product.aspx?Item=N82E16817153114
Keep in mind that 600 Watts is the minimum required by the GTX470/GTX480 cards. You can go higher in power, but cost rises as well.
Case:
I use Cooler Master cases. You can choose whatever suits your needs and fits your budget/space requirements.
Hard Drive:
I would suggest a Western Digital Black Edition drive. These drives perform well for the money. Unless you want to spend 3 x's the money for a 10,000 RPM 300GB, the WD500 is a great drive. SSD technology is still far too expensive for my tastes as of yet, not to mention the quirks. Nothing is perfect tho. $60
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136320
With this machine, you will be able to create, edit and render your home projects for many years to come without issue. And it saves you a chunk of change over an Intel setup. For $1,100, you will be quite pleased I'm sure. Some cost can be cut in the graphics department, if you dont want a high end enthusiast card.
Your only choice now is what Operating System you choose.
Hope this helps.