Photography tour of Grand Canyon

[sanfairyanne]

I want to do a river trip down the Colorado River and I wondered if anyone can recommend a company. I hear they're likely to be all booked up but whilst I'm in the area I thought I'd look into it.
Ideally I'd be moving at a leisurely pace so as not to be rushed when taking photographs and be with guides who are aware of photographers needs.

I know there are lots of companies on the internet but If anyone can recommend one that would be much appreciated.

Thanks