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I've pushed my 7D to 6400 during night sporting events and got great results.
FYI--went to Bosque in January for a week-end and wasn't happy with the photos. They had excessive noise and were not very clear. As I'm in VA this week and right next to the Canon Repair Center, I took my 7D in and they had to make electronic adjustments to the focus screen which was causing the excessive noise. Noise was unacceptable even an 400 ISO.
Nice hummers by the way.
I've been reading about 7D-noise and I am convinced now that it is not that bad - or as bad as people say... I think it all depends on shooting conditions and settings... but, the proof is in the pudding.... so I will keep shooting and try to figure out how to make it work...