So I went and checked these 3 watches out today and the Suunto d4i is the one that I would wear the most topside. This gives it the best value for me since the features of this and the atom are very similar. That is good to know about the different algorithms. I will read more into that but I am leaning D4i or dx (lol I might have a buddy with one in good shape he is willing to give me a deal on)