Need recommendation for a tablet with phone functionally.

1. Brand
Doesn't really matter but better if its a brand with a good track record

2. Budget.
Under 2k. Lower is better as long as it meets my requirements

3. Specs.
It is for work so I'd like it to be fast to increase productivity. It's got to be fast and snappy and capable of running multiple apps at the same time. The screen size should be around 7-8 inches.

4. What you need in the phone
Durability and battery life. It's got to run at least Android 5.0, the newer the better. Everything else is secondary.