Best programmable USB keyboard for small projects

Hi all,

I'm doing a project in which I have a configuration "notebook-like" and I have a USB host translating my keyboard to serial inputs for Arduino.

Can you suggest me a small and light programmable USB keyboard?

It should be like 20 cm long.
I'm wondering if there is a "most used" keyboard for this type of projects.

Any suggestion is welcome!

Thank you in advance

I have the RII mini X1 wireless.

Thank you for the answer, how do you connect it to the arduino?