Best Bluetooth Keyboard for Mac?

Seeing as it's cyber monday, today is the day I'll be getting a bluetooth keyboard for my Macbook Pro.

USB may be faster, but I can't spare another USB port because both are constantly occupied.

Thus, I'd like your opinion; What is the best bluetooth keyboard for Mac?

I'd prefer a number pad, but those seem extremely difficult to find for under 40 dollars, which is my limit.