Hi Scott, yes that is an Explorer 1, but that is a vintage model. It could be a ref 1016 or another earlier model. Those are highly collectible. Its the same 36 mm size as the model I was discussing the 114270 (made from approximately 2002 through 2010). To keep things simple I will pretend that the one in your photo is definitely a ref 1016... a 1016 has no white gold trim around the luminous markings, the numbers are more rounded, it has an acrylic crystal (rather than sythetic saphire crystal), the movement is different, and the bracelet would be an older style Oyster bracelet or Jubillee bracelet with the hollow "Clam Shell" end links. It also would not have the Oyster Lock Clasp with safety latch. Still vintage watches like that have their own charm, and tend to be better insulated from market trends and they retain their value and sometimes go up in value. A 1980s Explorer 1 ref 1016 will sell for several thousand dollars more than when it was new...I believe in 1984 its MSRP was $890 and you could by them all day long with a 25% discount. I haven't followed the 1016 market recently but I'd imagine prices could be anywhere from $4,500 -$6,000 depending on condition. People do seem to like the vintage ones a lot. You can probably get a good condition 114270 for significantly less than the price of a 1016. But it depends on whether someone wants a vintage or relatively modern piece.
The others in your photos are good choices, but the only one I truly like in your photos is the Ex1. Good luck and happy shopping!