big bike

I was wondering if anyone had a suggestion for a good commuter bike. i like the big bikes and need a good reliable commuter bike to travel 70 miles round trip in heavy traffic. i'll be threading the needle some and traveling at 65mph some.

Everyone seems to be telling me that a 600 is huge for a first bike, but I had one very experienced rider tell me that I should get the biggest [CC] bike I possibly can for my first because I will grow tired of a smaller bike within a week. As long as I am responsible with the throttle, there...