There's only one decent headset in your price range and thats the Hp Reverb G2. However the sweet spot isn't huge from what I've read - it's massively clear in the centre, but quite blurry at the edges. Also the controllers and tracking is nowhere near as good as the Quest 2.
I wouldn't bother with the Rift S as it's very low resolution compared to other headsets, and is EOL so warranty and parts could be an issue, plus it seems to be very finicky about display ports or USB ports.
The Index has the widest FOV and the biggest sweet spot and great edge-to-edge clarity, but it's £925, and has horrendous lens glare (Though you do get used to the glare).