Need help deciding

Coming fall I might buy a nice 2nd hand watch, if my finances allow it. I currently own a Fortis 638.10.141.3 and an Oris Big Crown Chrono 01 674 7567 4061-LS.

The watches I am looking at now are for example:
GH O Senator Power Reserve Display  100-01-13-02-04 
JLC Master Ultra Thin Power Reserve Q1378420
JLC Master HomeTime 147.8.05.S

My wrist about 17 to 18 cm. Are there any other nice options of watches like the ones I mentioned. For me 39mm is the smallest that still looks good on my wrist I think. I like a date and power reserve complication. Since my other watches are already chronos I do not want another chrono.

I am not rich, so for me the maximum would be €6000.

Are JLC and GH O similar in quality? Any tips or ideas are welcome.