You could probably go with something like this MCE Wireless Keyboard w/ Remote
. I use a similar product and it works well enough.
I also have this MCE keyboard
, but I do not like the little nipple for mouse control.
Both of these suggestions assume you have an OS with Media Center included (XP MCE, Vista Home Premium/Ultimate, 7 Home Premium/Ultimate).
Finally, I might recommend this Hauppauge WinTV-2250 w/ MCE Remote
for your DVR functions.
Note: The nMedia Keyboard is identical to my Adesso wireless keyboard and I've had some problems with it which Adesso failed to resolve. The key mapping is incorrect on mine.