I have someone in mind for that. 
@akeane - dunno why you are thinking 433, or worrying about the RF speed too much.
Here are four radio sets that are used in r/c hobby control:
edit: sorry, these links are obsolete. But the four radio sets by these numbers are what I am aiming you at:
CC2500 or this one (needs antenna soldered)
CYRF6936 Oops, obsolete, but may be available elsewhere.
I have used all four, all four can do continuous transmission of at least 8 channels of control many times per second.
THE NRF24L01 is probably the best known to Arduino users on this forum.
a7