If you haven't been through the drill, there are a few things to consider prior to making a life time choice.
Before that, my two cents is to respectfully skip the (not so) limited editions mentioned by some on this thread. Omega puts them out far too often and they charge quite a premium. From your OP, I take it that you are not looking for a collector's item. You want to buy a watch you will wear every day. A watch your son will identify with you as he grows up so when it comes time to present it to him he will forever refer to it as "my father's watch". My advice would be to first identify a watch both you, and hopefully your son, will be comfortable wearing. The Speedmaster Professional is a large-ish watch (42mm). Try one on before you commit to it. after all, you plan to wear it for about a quarter of a century before you pass it on so make sure you like the way it looks and feels on your wrist.
Once you have established that you like the fit, you can then move on to the type of Speedy you will buy. I vote for the standard Speedy Pro. The traditional moonwatch is the iconic Speedmaster. It is also a watch that was meant to be worn, not put away in a safe somewhere. One caveat on this is that most Speedmasters do not have very good water resistance. At 50mm WR, they will handle casual contact with water and even an occasional swim just fine as long as you have the seals checked during service, and as long as you don't operate the pushers underwater (Note: you will get some very harsh pushback on this issue from some people, but experts agree and will set you straight). The point is, if your lifestyle includes frequent rigourous water sports or activities like boating or diving know that your Speedy may have to sit it out some parts of your life on shore.
Now to the crystal issue. If you are a purist, hesalite is the way to go. However, make sure you can deal with plenty of scratches that you may, or may not be able to polish out with polywatch. The hesalite version is a scratch magnet. Some of the more anal types can't deal with that. Omega makes a slightly more expensive sapphire version which in my opinion is more suited for daily driver wear. You will get many very emotional opinions on this issue, but in the end it is your watch so do your research and listen to your heart. For whatever it is worth I wear the sapphire version daily and I feel it was a good choice for me.
As a final thought, if the watch fits your wrist and your lifestyle, the Speedmaster is an awesome choice. There are few watches that have such a history. Explain it to your son along the way. Teach him about the watch and what has meant to the space program. This will enrich his understanding of his father's watch and make it that much more special when it becomes his.
Congratulations and good luck!
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