I don't personally know either doctor, but they both have great reputations.
I had AN surgery - one year ago - and IMO although House is a wonderful place, I would not travel all the way to CA for surgery when you have a great doctor in your home state.
I personally could not imagine getting on an airplane a few days - or even a week - post op, and my side-effects were minimal. Also, from what I've heard from others who have had complications, CSF leaks, etc., after being released from the hospital, I would not want the doctor who performed my surgery to be in another state. Although everyone who travels to House has their own doctor at home who will generally deal with any post op problems, some think that is not the ultimate situation and I would agree.
I want to stress that this is just my personal opinion and others might agree or say something entirely different.
As for communication for your doctor in OH, I can't believe that he will not talk to patients unless they make an appointment. While I'm sure there are some patients who take advantage of their doctor's time unnecessarily, I think if you talk to Dr. Pensak and tell him of your concerns he will be more than willing to speak to you without an appointment. He may want some ground rules - hours you can call him outside of an emergency situation, circumstances that warrant an appointment, etc. - but I'd be surprised if he wasn't willing to accomodate your request.
Also, are you sure that this is his policy? I have a doctor who always says feel free to call with any questions, but on occasion I encounter a problem with his office staff not wanting to take a message for him to call me and I have to insist on it. This doctor is always fine with this and always calls me back. Some office staff decide they are "gatekeepers" even though that is not the doctor's wish. If this is the case with your doctor's staff, he needs to know about it.