Android phones, apps and tablets

What's the best new/unused Samsung phone I can get for under £200? I'm tired of Huawei and I just want compatibility with everything.

Ideally:

• Screen between 5.5-6.0"
  
• Water resistant
  
• Earphone/aux 3.5mm port
  
• Wireless charging
  
• Camera not terrible
  
  

Maybe an S9 or something like that? Is it better to buy newer low-spec or older high spec?

I'd normally buy new, but would consider buying second hand from some trusted LFGSS person (rather than an eBay chancer), so if you have something do let me know. Thanks.