I, too, was excited about the 8, but the rumors weren't sounding that significant, but I was gonna go for it anyway because they were supposedly bringing back silver aluminum, and I had a S5 silver aluminum I wanted to upgrade.
Then Amazon had that deal: $529 for a new S7 45 silver SS.
And I thought man, that's the same price I'm about to pay for a cellular silver Al S8 that doesn't seem that much of an upgrade.
So I got the 45 silver SS. Wasn't sure about the weight, but I'm actually like the watch a lot and noticing the weigh rarely. I am fortunate to be able to own more than one watch, so I trade out when I'm wanting smaller or lighter.
All this is to say this sounds like it might be a great time for you to experiment with a different size or metal (or both) on a discounted 7--so if you don't love it, you maybe don't feel like you 'wasted' as much money.
Also, if I could choose only one watch though, I would go with my 41 SS. Love the big 45, but if I could only have one, it would be the 41 for weight, aesthetics on my wrist, and still big enough to read.
Just some thoughts. Good luck!