Roger do I hear a cry in your post saying I'm active? I do believe I do.
Hey, if you went mechanical, there is no reason that you could not do any of those things, except perhaps the weight lifting, it depends on what you mean by low weight. I have a mechanical valve and I'm on Coumadin. I want to tell you that you will hear so much bogus information about Coumadin, and much of it will come from the very people you trust to know better, your Doctors! They have not grasped the concept of how this drug works even though it's been on the market for years.
Valve choice is personal and even then, sometimes you do not get what you want. My advice is for you to choose what you'd want first, second etc,. and then be happy with what it is. Looking at your age, how would you cope with another surgery 10 years or so down the road? I know that's hard to answer when you haven't been through it once yet, but I'm here to tell you it is very hard and you may not want to go through it again. You may not have a choice either. What I'm getting at is that having this surgery one time is too much. Multiple times borders on insanity.
People hinge their bets on what the future may hold. Well that's fine if your a betting person, but your problem has to be dealt with today or there might not be a future. It's true heart surgery and valves have come along way in just the last 7 years, but don't look to the future to hold anything stellar in terms of significant gains in technology. It's your life, do you want to gamble with it?