I have had a CANON 60D for 3months now - no regrets.
I am so impressed with this CAMERA I have also bought >$3500+ worth of glass.
My only disappointment was a 20mm F1.8 Sigma lens (rubbish).
The 60D has better low light performance (much clearer @ ISO 3200) than the GH2.
In addition, there are over 150 different lenses specifically made for the CANON (not counting all the others that work with adapters). Lens choice is huuuge for the CANON, and with the massive CANON user base, lenses are critically reviewed - usually by two (ore more) different independent technical reviewers.
You will easily be able to find the lens you want for the CANON.
Also, lens adapters are available with built in ROM that will let most of the other lenses ever made work with, and talk to (in a basic way) the CANON camera.
So, given that the CANON has better low light performance, and has the greatest lens choice by far, and can record @ 1080P 25fps & 30 fps (the Nikon 7000 cannot do this) - then I think the choice is clear.
Example1: Last weekend I was smooth panning a 100KMH+ jetski from the river bank with a CANON 300mm USM IS lens + CANON 2x converter making a total of 600mm !! and I was able to keep the jetski smoothly centred in the frame (often filling the frame). I am totally impressed with CANON's 2mode Image stabilising - the auto motion detection allowed horizontal panning whilst eliminating vertical shake. Very, VERY impressive. CANON has catered to the pros for a very long time and has this technology - don't fight it, get on board and don't miss out by jumping on the wrong horse !!
Phill Bloom is right (read his blog), the CANONs have better image quality than the GH2.