If you count the other pieces manufactured by Patek (that are extremely hard to find and require approval before ownership is bestowed) such as the minute repeater complications, the complicated pocket watches, and other super rare (and not normally attainable) exceptional pieces; then I would not consider the 5970 a top 3.
However, I do have tremendous respect for the 5970; it is an instant classic, and this is the watch where I am fond of every single dial design in every single metal (except for the platinum with black dial, I'm not sure about that one yet because it's new and I haven't seen enough photos of it).
If you have the opportunity to acquire a 5970, you should seriously consider it! It's a beautiful watch, and a very significant watch to add to one's collection. One of the few non-in-house movement watches I really like.