Go with CM690 cuz its cheaper and will do the work..........
man dont worry about case's to much.......i am on a 10$ case from intex since the past 5 years ........and works perfectly (cooling)........i have a 9600gt in it......
I've always considered the NZXT Tempest to be a "cheaper" model of the Antec 900. The Antec 900 is at a really good price right now and should be considered over the NZXT... IMO.
With all of that being said... I would recommend the CM690 case over the other two cases, since it is roughly $30 cheaper.
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