Let's just assume for now that it isn't a stupid idea to build a rig from scratch with improved CPUs and new GPUs around the corner (but if this is irredeemably idiotic, then please tell me).
Also, I've gone through about a thousand different configurations on paper and my brain is starting to fry, so if something here is hilariously out of place, that's why.
CPU: 200$ or 320$ i5 2500k OR i7 2600k
Leaning towards the i5, but I actually DO use a pretty significant amount of video editing/encoding software, etc, which I believe the i7 would give a decent boost in. Worth an extra 120 bucks? Probably not, but that's just me.
Compare the numbers. 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:
Yeah its a lotta money for the case but you did say $2k and not only is it gorgeous and win design awards but it's features are unequaled. Antec 1200 V3 or DF-85 w/ CP-850 is a $275 alternative to the $420 above. Another option would be the Corsair 500R w/ HX850 ($265)
These OC very well (30+% over reference speed possible). Outta the box, they 10 % slower than twin 580s which cost twice as much...they 14% faster than twin factory OC'd Twin Frozr 6950's and 5 % faster than twin 6970's in Guru3D's game test suite http://www.pureoverclock.com/review.php?id=1201&page=17
The Chronos makes Tier 3 along with the Patriot Samsung 830, and Vertex 3 Max IOPS ....other well knon models go from Tier 5 to 8 at 129/128GB size. The Force 3 is Tier 8 (about 61% slower according to the chart's 10% per tier statement) http://www.tomshardware.com/reviews/best-price-ssd,3070...
That takes care of blue ray movie watching, fan control and and card reading req'ts
So yes at $2k ya can have a monster performer....wanna cut it down and the Corsair or Antec Case/ PSU combo will save ya $150 (If noise is an issue, Id take the Antec)..... as everything else is top notch, cutting will have an effect on performance. May wanna go to 16GB and maybe faster RAM id video editing is a regular thing: