Mechanical or Tissue Aortic Valve

I'm a 49 yr old male and was recently diagnosed with an enlarged heart, leaking aortic valve and narrowed heart artery.  I just met with my surgeon who told me the leaking valve needed to be replaced (no repair) and I would also need a single by-pass for the narrowed artery.  I was also told I have CAD and heart valve disease.

Based on my age (no other health issues), I was told I needed to decide on the type of valve to use (tissue versus mechanical).  I've been trying to research the various pros/cons regarding the different types of valves and am leaning more toward the mechanical valve but am gravely concerned about a reduced quality of life (and other potential side effects) associated with having to take anti-coagulants (Cumanin) for the remainder of my life.

According to the research I've read, there seems to be a shifting view in the medical community towards using tissue valves in younger patients (very similar life expectencies after factoring in additional valve replacements).  
My question is do you have a recommendation on the type of valve to use?  Also, am I too concerned about Cumanin?

[Encephalomalcia]

A pig valve is a very good valve, but it most likely will not last your entire lifespan.  There is a procedure that the surgeons are now doing, which they replace the valves through a catheter instead of open heart surgery.  The procedure or this type of surgery is still in the yearly development and there have been some complications of excessive bleeding.  You may want to discuss this with your doctor.  Our surgeons have told us that in the near future, there will be no more open heart surgery.  Heart disease procedures, medicines, and stem cell will replace the need for open heart surgery.  

Mechanical valve will require you to be on coumadin for the rest of your life.  Coumadin does have risks such as osteoporosis, stomach cancer, and thinning of the arteries.  My Dad is on Coumadin because of an irregular heartbeat.  I have tried to talk him out of taking it, but he is afraid of a stroke (he has a 10% chance of having a stroke due to irregular heartbeat per his doctor).  He does not have the energy as before he started taking Coumadin and when he bumps himself, he gets very black and blue.  

I know people who have the pig valve, and they have done very well.  I do not know of anyone who has the mechanical valve.  Big decision.  Take your time and way out the pros and cons.  Research all that you can throught he internet.  Take care.