Andrea,

I would suggest that, as others have pointed out, on Voyager stay with midship cabins. You may not be bothered with the vibration, but it exists in the aft cabins.

With respect to airfare: I have found, in general, that air price offered by Regent is high, especially if you are traveling in the off-season.What I would do is do a price comparison of how much the air would cost you using one of the airfare search engines likes travelocity, orbitz, etc. and compare to the Regent cost. Make sure you factor in the cost of transfers from the airport to the port as I think Regent covers that if you buy the air from them.

Good luck!