Hello all, I'm looking to get a smartphone for my dad to replace his faulty Lumia 525. I'm looking for something along the lines of:

1. Brand - Any brand is okay, but it needs to be running Android, preferably as close to stock as possible (my dad currently owns a Nexus tablet so the UI will be familiar to him).
2. Budget - Not more than 1.2k.
3. Specs - Not too sure about the current specs for this price range, but higher would obviously be better. A decent battery and camera would be nice.
4. Type/Size - Prefer to avoid very large devices if possible. May make an exception if the specs-to-price ratio is tempting.