If it was me i would look into:
Cpu: Intel I7 2600K Quad Core CPU, cant fault it but if you want to save money can always go for the 2500k
Mobo: all the ones you have said are good, just depends if you want to save money, with the price differences if there is any.
GPU: MSI GTX580 Lightning Edition, i would stick with nvidia only because you get stuff like physx with them, plus then you could always fold for the team
PSU: I would really recommend a corsair psu over a ocz one and 1250w seems a bit overkill with just 1 graphics unless you are going to add another one later
Ram: I would look into mushkin ram or the recently reviewed Kingston Genesis, 2000mhz doesnt really apply for sandybridge need 2133mhz
HDD: Wester Digital 1TB Caviar Black, ive got the 2tb version and its very good
SSD: Ocz Vertex 3 120GB, meant to be good but also have a look at the kingston v+100 range and corsair force
Case: Go with whatever you like, i would advise against the thermaltake level 10 though, it is whatever you like the looks of really they all provide decent airflow
H/S: you forgot cooling for the cpu so noctua nh-d14