Mehrts:
I'm going to hold out for the Series 8, unless my Series 4 craps out before then.
I feel like the Series 7 doesn't have too much more to offer than what I already have with regard to hardware, except for the differences in display and blood oxygen monitoring.
Most of the differences that I can find seem to be due to the new WatchOS version, which is a moot point, since the Series 4 runs this too.
I'm in the same boat.