Good choices...the B-42 Cosmonauts GMT Fortis is really a great watch, especially for the price point...rugged and easy to read, you can wear it in the cockpit and not worry about it. And I like the Airman line of Glycine (especially the Airman 9 chrono which they discontinued...a GMT chrono is hard to find). Bell & Ross doesn't do much for me, except their Vintage line...the 126 is sweet as I like two register chronos quite a bit. I don't like the Instrument line that much, but the divers they introduced last year as part of that line are OK. I'm also a huge fan of Sinn...they make some fantastic aviation watches that are very easy to read.
Here is a chronograph with a UTC/GMT hand and a dial designed like a cockpit clock (which Sinn has made in the past); definitely on my short list to get:
They made watches before Bell & Ross; in fact they made watches that were later re-badged as Bell & Ross watches.
I have a few Citizens to include one of the Skyhawks. Almost impossible to read the little subdials in low light.
I didn't realize that Sinn OEM'd watches for B&R. I don't like the hugeness of the B&Rs myself, but like you enjoy their vintage line.
I'm currently looking into the Seiko "5" line...
They can be had under $100'ish and the calibre seems interesting for the price. Like to see how they keep time. I hate my Fortis, have to time hack each day before the first hop because I lose about 2 minutes a day. Yeah, mechanical is nice, but unless you're looking at getting it chronometer certified at $200+ a pop, you're better off saving money and going quartz for something less expensive. Don't regret the purchase, it's just not practical to for me day to day flying. There's a price paid for being a moss back (guys that hold on to old ideals; Norton motorcycles, BSA's, my unreliable Ducati, watches that lose 2 minutes a day, etc)... last thing I want to mess with is a mechanical watch that I had to monitor everyday.
I think the Seiko's are somewhere between 37mm to 40mm in size. Need to see them in real life first. At those prices, I can get a couple.