Get a Logitech G600!
After my Naga decided to wear out after barely two years of use, I decided to try something else in hopes of getting a more durable product. Thus far, the Logitech has been great, and the side keyboard is much better than the Naga, due to the way its designed. After using for the past 6 months, I definitely think that anyone considering a Naga for side-keyboard should look at the G600 instead. Same price, better mouse.
This concludes my product placement. :p