I would say you are correct here Matt,
Radio and light waves are both Electromagnetic, so barring any disturbance from the atmosphere then they would be the same, both should travel at the same speed and even if they are affected, would probably be affected in
the same way and therefore be at the same speed.
Here is a good reference on the subject with a line that probably answers the "typical" wrong answer to this question as people think of sound waves as radio waves as they associate radio with sound.
http://www.aerospaceweb.org/question...my/q0254.shtml
Now, go and get some sleep (if I am correct like you that is)
Cheers
Chris
edit: Funny thing further down the page where someone has listed the distance in miles and km to stars etc and even when they are talking in "quadrillions" of miles etc, its funny to see the disclaimer at the bottom of the table saying "Your mileage may vary"
