Thank you for becoming a member, it will make getting and offering help much easier, and of course welcome to Android Central.
This is kind of a subjective question, I'm sure you'll get several different answers. To me the obvious answer would be the Pixel 4, given your price limitation and I hear it is quite a nice device. However I recommend moving this to the Pixel 3a forums where you can talk to other Pixel 3 owners and see which devices they are considering and why.
Moderator please move this to the Pixel 3a and 3a XL threads.
In the meantime while you wait you can join in any of the conversations in that forum by following this thread...
https://forums.androidcentral.com/go...a-pixel-3a-xl/