Lovely, for me the hesalite is the one, I just love how it looks, even the OMF reps (they may not be hesalite, but they are some kind of plastic, they aren't sapphire crystal) have a gorgeous distortion at the edges.
Until I wore one (and it's a terrible rep!) I'd never have known how good they are.
Now, if I had to buy one gen, with my own money and wear nothing else, it might be a Speedy, they're on eBay ~£3k, that's good value (in the gen watch world!)