Case - Excellent case .... alternatives to consider are the Antec 1200 V3 and DF-85
PSU - I'd go with the HX850.....lower price, better jonnyguru rating ....alternate ....if ya consider one of the above alternate cases, you can use the CP-850 which. It's scores higher thna the AX850 and matches the HX850's 10.0 performance rating ..... however, the CP is cooler, quieter and much less expensive than the Corsair PSU's
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=142
[The CP-850] is completely unmatched by any ATX unit on the market I can think of. You'd have to spend twice as much as this thing costs to find the next best thing, performance wise.
Your Case / PSU combo is $370 .... The Antec combo is $270 .... that $100 buys a better SSD and HD and sacrifices nothing....in fact the CP-850 scores 10.0 to the AX850's 9.5 on jonnyguru.....
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=197
MoBo - Asrock does not offer an industry standard 3 year warranty. If you're OK with their 2 years, no reason to worry. It worries me personally so I'm using one of these depending upon budget
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&N=-1&isNodeId=1&Description=asus+gen3&x=0&y=0
CPU - Won't need it for gaming but the 2600k will help a lot w/ the video editing
CPU cooling - water cooling on Sandy Bridge is a waste of time, money and effort.
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=674&Itemid=62&limit=1&limitstart=5
It's almost ironic that coolers like this are becoming available just as processors transition to designs that may ultimately render them unnecessary; even overclocked to 5GHz, an Intel Sandy Bridge 2600K doesn't need anywhere near this level of cooling
.
$30 - Hyper 212+
$50 - Scythe Mugen 3 (5 - 7C better than the 212+)
$80 - Thermalright Silver Arrow
RAM - Vengeance is a good choice but ya want the low profile versions ... without the toothy heat sinks.
http://www.newegg.com/Product/Productcompare.aspx?Submit=ENE&N=100006519%2050001459%2040000147%20600006050%20600006127%20600006069&IsNodeId=1&bop=And&CompareItemList=147%7C20-233-196%5E20-233-196-TS%2C20-233-186%5E20-233-186-TS%2C20-233-199%5E20-233-199-TS
SSD- I'd either hold off till ya can afford a bigger one of the current generation or stretch that budget to 120 GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148448
HD - "green" = slowwwwww. For video editing boxes, I use the Seagate Barracuda XT. The 2TB model is a bit more affordable than the 3 but the 3 is faster and bigger.
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=708&Itemid=60&limit=1&limitstart=10
GFX - For video editing, there's a likelihood that your software benefits from CUDA so that means nVidia.
http://www.studio1productions.com/Articles/PremiereCS5.htmhttp://www.studio1productions.com/Articles/PremiereCS5.htm
http://www.studio1productions.com/Articles/PremiereCS5.htm
In Guru3D's tests, the factory OC'd 560 Ti's produce numbers very close to the 570 and, in SLI, pass both the 6950 and 6970 in CF.
Guru3D uses the following games in their test suite, COD-MW, Bad Company 2, Dirt 2, Far Cry 2, Metro 2033, Dawn of Discovery, Crysis Warhead. Total fps (summing fps in each game @ 1920 x 1200) for the various options in parenthesis (single card / SL or CF) are tabulated below along with their cost in dollars per frame single card - CF or SLI:
$ 240.00 6950 Frozr OC (484/
759) $ 0.50 - $ 0.63
$ 205.00 560 Ti (455/
792) $ 0.45 - $ 0.52
$ 360.00 6970 (526/
825) $ 0.68 - $ 0.87
$ 205.00 560 Ti - 900 Mhz (495/
862) $ 0.41 - $ 0.48
$ 320.00 570 (524/873) $ 0.61 - $ 0.73
Since you seem perty sure you gonna double up on the GFX cards, I highlighted the CF / SLI numbers in bold text. I'd get just one 560 now, overclock it from the factory OC'd 900 MHz to 1000, for $205 - $230 and put the savings in the bigger / faster SSD. Later on add the 2nd 560.....They start at $205
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=-1&IsNodeId=1&Description=900MHz%20560&bop=And&SrchInDesc=Ti&Page=1&PageSize=20
27" is a bit big for 1920 x 1080. I'd suggest a 23'6" model if you want to avoid the graininess that comes from having too large a monitor and being able to see the individual pixels.
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236052
1) what gpu do you recommend for my needs? - The 900 Mhz 560 Ti, especially for CUDA enables video apps
2) can the 6950 still be unlocked to 6970? - They wise to this trick and either gotta find an old card or a "rare bird"
3) will my mobo be able to add sli or crossfire? Ones I referenced do
4) can i add a second smaller monitor for when i am not gaming? - yes, for the usage described.... since you said "if not gaming" than the extra memory on the 69xx series isn't an issue. 6950's scale about 154% on average accordin g tot he Guri3D tests .... 560's about 175 % on average