Michele -
In my NON-professional opinion, you would be best served by a Cardiologist and CardioThoracic Surgeon who has considerable experience doing surgery of the Aorta.
Mass. General and Brigham and Women's Hospitals are probably the Best in New England and have several highly ranked surgeons. You could Call the Hospitals or go to their websites and look for "Find a Doctor", starting in Cardiothoracic Surgery and then narrow your search to those who do Surgery of the Aorta (or Aortic Aneurisms). I would expect that there is at least one and maybe more than one such specialist at each of those hospitals.
Several of our members have used those hospitals and some have expressed preference for one or the other for various reasons. You could do a Search for MGH or B&W (and the various full names) to see if you could find those posts.
My mind is drawing a blank on the name of the Aorta Specialist at Cleveland Clinic. He is from South Africa and World Famous. AH, Dr. Lars Svensson is the Director of the Aorta Center at CC. Do a Google Search to check out his background if you are still interested in CC.
http://my.clevelandclinic.org/staff_directory/staff_display.aspx?doctorid=4359
Personally, I would recommend a thorough investigation of the Boston Hospitals first since they are so close and should have surgeons qualified to do what you need.
One more *opinion*. Once your heart valve / aneurism problem has been identified, there is not much that a Cardiologist can do for you other than to recommend a good Surgeon. IMO, Surgeons have a better 'feel' for timing based on their desire to "Fix the problem" Before there is any Permanent Damage to your Heart Muscles and walls.
FYI, the Gold Standard for measuring and monitoring Aneurism's is either a Chest CT or MRI.
'Al Capshaw'