1. Will you benefit from Z68 ? If not, don't rule out P67.
http://www.ukgamingcomputers.co.uk/difference-between-h67-p67-z68-and-h61-chipsets-a-22.html
2. Twin 570's will get ya 873 fps in Guru3D's gaming benchmark, twin 900MHz 560 Ti's will get ya 862 fps. Give up 11 fps and take the $280 savings and get a better SSD. The 570's are not known as a very good OC'er.... many peeps have fried their boards exceeding manufacturer's voltage spectrying to recah their goals. OTOH, the 560 has much more robust voltage control circuitry and does very well OC'ing. I have OC'd 7 outta 8 of the Asus models to 1000MHz w/o any voltage adjustments, the last needed just 1 notch. The oversize coolers on the 900MHz models come in handy here.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121425
3. i7-2600 w/ HT good choice for the Photo / Video work. Set up multiple BIOS profiles allowing say 4.8 GHz w/ HT on for the apps and 4.8GHz with HT off for the games.
4. RAM - Same specs, $20 cheaper and lower profile.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226203
5. AX1200 way oversized....AX850 plenty for either GFX choice. Though I'd also look at the CP-850 which is a fraction of the cost but every bit it's equal (10.0 jonnyguru performance rating) but that would require a compatible case (Antec 12003, P183, P193, DF-85.
http://www.silentpcreview.com/article971-page7.html
6. I'd get the Seagate over the same price WD 2TB
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=708&Itemid=60&limit=1&limitstart=10
.... the Barracuda XT series offers the best performance available from a 7200 RPM mechanical storage device.
The Constellation is actually substantially faster but huge price tag.
7. Vertex 2 is last generation 275ish MBps.....Vertex 3 is 550 MBps.
8. I'd use the on board sound ..... can always add card later if you start doing professional sound editing.
9. You did mention Photo Editing and this warrants a IPS panel..... choices:
Dell U2412 - about $400
ASUS ProArt Series PA246Q - about $500
ASUS ML239H - about $180 .... this just sounds too cheap for an IPS panel
10. Cooler - High end coolers are really not needed on Sandy Bridge. H100 has great performance but in fact no better than the better air coolers such as the equally loud V6 GT and almost dead silent Silver Arrow..
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=674&Itemid=62&limit=1&limitstart=5
It's almost ironic that [air] 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. Still, it wouldn't hurt, and as I noted earlier, there are still CPUs out there that can benefit from it.
The Silver Arrow for example matches / exceeds the H100's performance unless ya push pull some very load fans and the Silver Arrow's stock fans very quiet.
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=674&Itemid=62&limit=1&limitstart=4
http://www.overclock3d.net/reviews/cases_cooling/corsair_h100_review/1
http://www.xbitlabs.com/articles/coolers/display/corsair-h100_5.html#sect0
http://www.xtremesystems.org/forums/showthread.php?273931-Thermalright-Silver-Arrow-VS-Corsair-H-100