[rehemiau]

The mid-range processors to look at are Qualcomm 625 and 630

1. Nokia 7. The new Android-based HMD Global's Nokia is providing the fastest updates on the market. And the phones look really nice. Just came out so I think you'll have to wait for it or get a slightly less powerful (but also cheaper) Nokia 6. Or a Nokia 5. Or even a Nokia 3, if it's powerful enough. All of them should receive Android Oreo ([source](https://twitter.com/sarvikas/status/903867368052490240)]

2. Xiaomi Mi A1. Thanks to Android One project the phone should deliver both great stock system experience and fast updates. Unfortunately not available in every country.

3. Moto G5 plus. Stock Android and prettty good updates. But not as good as Nokia's.

4. Buy a cheap Xiaomi and install Lineage / other OS. The model I suggest is Redmi Note 4. I personally have a Redmi 4 Prime because it's smaller, but Note 4 has better ROM support.