Of course it's how you ultimately feel. But here's my opinion. Based on what you wrote, I suggest the Omega Planet Ocean. Your one concern is the “small” size but, unless you have a very flat, wrist 39mm is a good proportional size for 18cm. And you mention slender forearms, so your range should be 36mm to 45mm with a technical sweet spot of 39mm, 40mm or 41mm. I’ll also second the Longines Heritage line. Finally you seem drawn to the BB58. Similar to yourself, the adjustability of the metal clasp bothered me so I retrofitted it with a Rolex EasyLink. I like the rivets, but If you don’t, then buy an aftermarket Oyster bracelet made specifically by the BB58.