I own quite a few of the references you are considering or that have been recommended I would go with the 214270 because of the versatility it affords a small collection. While I like the thought of a Speedy, I think with two Omegas it would be nice to diversify your collection.
BB58 -- I really like the look of this watch but am disappointed by the execution. Specifically there is no half link for the bracelet and only three notches of adjustment in the clasp. I personally believe this is to differentiate Tudor from Rolex and their bracelet/clasp combination. I even tried adding the easylink from my Explorer to see if that would work, but the screws are different widths. I have had the BB58 less than 3 weeks but am considering selling it already because the bracelet does not fit me well.
Explorer 214270 -- I think this is the most versatile watch in my collection. It can be dressed up or down, looks good with jeans or a suit. I like the 39mm size but some think the 36mm older versions are better proportioned. This is a great under the radar Rolex. I tell my wife that I enjoy having a Rolex that most people think is a Timex.
Explorer 16570 white or black -- I sold the black one but owned them both for a couple of years, have kept the Polar. I like the look of the black on other people's wrist, but I rarely wore it. The white one rarely get worn but fits in my collection well. If you want something around 40mm that is different this is a great option. It wears smaller than the newer Rolex models in 40mm but that is a good thing.
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