Windows Tablet or Hybrid - Selection Advice Needed

I want to purchase a small tablet that runs Windows, but that is powerful enough to hook up a monitor and full-size keyboard when I am at a desk.  I've seen the tablets that have a keyboard that slides behind it, and those look like a good option.

I use a laptop at work, but it is too awkward when I am out somewhere and want to access it.

I use Microsoft Word, Microsoft Access and email at work.

I've been running into problems lately (summertime!) where I am out somewhere and don't have my work stuff with me to respond to an issue that is occurring.

Any other options would also be greatly appreciated.