I have two labellers:

1) @Work: PT-1230PC - it doesn't have a keyboard but since my office computer is always on it's really easy and quick to create nice looking labels.
2) @Home: Brother PT-1750 - older model but this one has a QWERTY keyboard and is really quick at creating labels without a computer.

I agree that having an integrated keyboard is a really good feature to have - if you can find a reasonably priced one that has a keyboard and PC/MAC connection that is the best solution.

My only complaint it that the Brother TZ tape tends to be fairly expensive here in Canada - so I stock up when I visit the US.