for video card you do not need top of the line.
my sig rig is my video editing machine and it runs premiere pro CS6 incredibly well and renders very quickly.
what camera do you plan to use? do you plan to own or rent camera gear or do you already own your own. as a media professional doing mostly TV freelance camera work, i can tell you that its crucial to have a powerful and reliable computer to edit but the camera gear is going to eat your budget even worse. especially from just the main gear with camera, auido, and tripod. lighting is a totally different monster of expense.
my personal tips for you on just computer. if you want camera and equipment advice i can also help a lot if you need it. (i do mostly documentary field work and ENG/EFP work thats is lots of run and gun type of shooting)
for your video card you will need a nvidia card. you do not need a super expensive one as there is no major performance gains unless you start working with workstation TESLA cards. make sure if you do buy a high end card that you do not waste your money on a card with 2 processors such as the GTX 590 or 690 as Adobe CS6 will only take advantage of half of the card because the adobe suite does not currently take advantage of SLI or multiple GPUs.
for CPU more cores are better. honestly my 3770K at 4.6GHz works wonders. you will not need water cooling as that is truly not at all necessary unless you do an extreme overclock. if you do overclock make sure its SUPER STABLE. if it can fold for like 7 days straight without crashing you should be pretty safe. i let my rig fold for an entire month a while back while i was working a TV contract and didnt edit at home.
SSD are your friend. make your boot drive an SSD and install CS6 on that drive as well. if your budget can float it make a large SSD your scratch drive. and then use mech drives for storage. RAID is definitely a very good idea.
Also depending on what type of footage you are working with such as HD, 2K or above will decide how much ram you will want. honestly for regular HD footage out of DSLR cameras 16GB is plenty to render video in premiere while also running photoshop, speedgrade, and after effects at the same time. most top of the line pro workstations for video have 2GB RAM per each thread on the CPU. you dont need that but with pros money is generally not a limiting factor on equipment
*The only way to use 2 GPUs at the same time is when you combine a tesla card with a quadro card to make a Maximus setup http://www.nvidia.com/object/maximus.html
My sig rig without my GPU was just under $900 at microcenter. I still need to add more storage space but overall my rig is a complete work computer that is fairly easy to upgrade. i would have bought a larger case but went with reliable and cheap lol. The smartest thing you can do is buy into whatever the newest and best CPU chipset there is if your budget can handle it. That way down the road you can upgrade your CPU without needing to buy a new mobo as well. and even if you went with something like my sig rig, you can still upgrade CPU and mobo and everything else will still work perfect in your video workstation
these links will help you a lot:
http://forums.adobe.com/thread/525263Edited by Conspiracy - 4/1/13 at 8:44am