I really love that Sea Lion... what a unique piece!

Nothing exciting about the Rolex, other than it being a Rolex.  You have a GS already, but maybe you could trade up to get the Shōsho dial.  

The Breitling is the most interesting; it's not my color choice (I'd go for the pistachio B09), but if you like minty green, the Navi certainly delivers - and wherever you go, you can count on it being the only one in the room.  I think it really comes to life on a brown leather strap:

You can wear pretty much anything with casual clothes - although a gaudy watch becomes the main event if there's nothing else to draw people's attention.  If you're OK with that, strap on your 222, or a blingy Rolex, and have fun.

(It doesn't work in reverse, though:  Wearing a big plastic G-shock with your tux or 3-piece pinstripes makes people question your judgement.)

Somebody has $600 to spend, and this is what they want... so what's the problem, exactly?  Some have $30k and want a bog-standard Rolex. The only reason to whine, in either case, would be that you want it, too.  

Pick any price, and there are many, many thousands of watches to choose from  (eBay has >19,000 available at $450-$500.)   There's not a lot for a collector to complain about.

I don't think Seiko makes a "bad" watch these days.  I'll buy anything they make if I like the way it looks - they're meant for wearing, not for queening in a collector's case.

Seamaster (Master Chrono or Aqua Terra), when I have the $$.

(Ultimately, a Breitling "pistachio" B09, when I have the $$$$.  😍)

Green dial Khaki Field mechanical for weekends outdoors, GS "Sea of Clouds" for being fancy, and the Max Bill automatic pretty much all day, every day.  

The GS is their high-end quartz, good for about 2 seconds/year. (Have a Tissot Gentleman that somehow matches it tick for tick, but it doesn't get much love against the competition here.)

Still on the prowl for a diver - maybe a Seamaster, if I land a big job, but a Zelos would be nice in the meantime (I like the looks.)