I'd go with XBee.
With the amount of 2.4G around here I'm amazed at how well they work!
Have a look at my Rover 5 video, both the XBee and the camera are on 2.4G.
Neither minds a bit.
My analogue 2.4G video sender/receiver is totally swamped, I had to shut down all the Phones, cell and cordless, AP's, Laptops, Netbooks to get a picture.
So to use the analogue video link on my rover I bought a pair of 900Mhz XBee modules.
Ya, those 2.4GHz video transmitters are notorious for swamping the 2.4 spectrum. Its why a lot of people don't like them. They tend to be rather indiscriminately hostile to any 2.4GHz device in the general area. They frequently make all 2.4Ghz other users in the area rather hostile to those who use them. Even been known to fracture relationships with neighbors. They cause problems for WIFI, bluetooth, baby monitors, and wireless phones.
Honestly, for anyone wanting to do video, I encourage you to do it on a different frequency than 2.4Ghz.