I'd wait for an S5 or better. For me, the Always On Display was a game changer. I wouldn't buy an S4 at this point.
My S2, S3, and S4 were the only watches I've owned with a blank inactive display since I had a late 1970's LED digital watch.
With the S5 it was nice to get back to being able to simply glance at my wrist to see the time with no arm/wrist movement required.
Check Swappa.com. Check Apple's refurb store. Watch https://refurb-tracker.com/ for Apple refurbs.
Is AOD a really big thing for you?
Why not?Thanks but I'm not looking for a refurbed one.