Best wireless Keyboard/Mouse combo?

[big4x4]

Been looking at the mx5500 as a replacement. Anyone have any experience with them? My mx3000 has been nothing but reliable but it's time to upgrade. How about the diNovo desktop combo? Thanks for the input!

 

[Slugbait]

The MX3000 is a little better than my MX Duo, and I love my Duo. If it's been nothing but reliable, why is it time to upgrade?