To answer a few of your questions
Gen1 - they did not do a civi version but they did use the movement in other watches and there are numerous versions to choose from, they are worth a look but the movement is now obsolete so if it packs up you need a donor watch to get it repaired. They are a nice little watch and the 10th sec counter is cool to watch wiz around. There is a guy that seems to have a small stock of theses on MWR at the moment.
Gen2 - yes there was a civi version, it’s identical to the issued watch bar the case back markings. Even the dial is identical including the circle P, it has fixed bars as well. These are one of my favourite issued watches, they are small thin and very easy to wear. Again the movement is obsolete so a donor movement is needed, they are not as easy to find though. Supply of these seem to have dried up.
Both Seiko sell for about £700-800 currently. Gen1s being a bit more.
Pulsar - again there is civi version it’s cheap as chips! The issued watches are also cheap for an issued watch. They are a nice watch but they are not as good quality as their predecessors. The gen1 versions had a weak stem and crown from memory. Gen2s changed design and look more like the civi versions The newmark reissue is a better quality watch IMO.
I can’t help with the Hamilton Khaki, it’s a nice watch but I don’t like the date.