Those tall, toothy heat sinks may "look cool" but that's the extent of their cooling capacity. Get the low profile ones which will run at the exact same temps but won't prevent the installation of a decent CPU cooler.
The H100 gives ya about a 1/4 degree over the better air coolers but's it loud and for 1/4 degree I don't see enough advantage there to put water inside an electronic device.....again, not when I can get this from air
GFX - One 680 gets ya 57 fps in BF3, 2 will get ya 101 ..... get one now and save the money ..... buy a 2nd one for XMas 2012 or 2013's big games....and an HX850 with its 10.0 performance rating from jonnyguru will serve those two cards well.
MoBo - I'd wait for the "Pro" version of that MoBo.....deluxe is more money for features ya don't need. Asus is slamming anxious early adopters with a nice $$$ whack here for peeps who don't wanna wait.
Sound Card - Redundant ..... the one on the MoBo is just fine.
Case Antec 902 V3 - is a fine case but I like the Corsair 500R better