How many days do you have? I don't have any scoop on one helicopter tour vs another, but from Phoenix you probably want to drive up and catch one at the Grand Canyon airport. If you do that, don't miss the side trip to Sedona on the way up or back. You can make a nice loop out of Flagstaff by taking 180 to the Canyon, then 64 along the rim, then 89 back into Flag.
Our winter weather is going to make you wish you had that 650 along with you.
'11 BMW 1200GSA
''11 Husky TE449
'08 Polaris RZR
'09 Vespa GTS 250