There are plenty of options
There are plenty of options out there. IR/RF/Bluetooth. This site is an excellent resource for reviews on them. Check reviews. In my experience it would be helpful to separate the need for a full fledged media center keyboard/mouse and just the need to point and click. I only use my MS media center keyboard when I need to type. Most the time I am only pointing and clicking, though. I use this Lenovo Multimedia Remote with Keyboard N5901 http://www.amazon.com/Lenovo-Multimedia-Remote-Keyboard-N5901/dp/B0036VO67I
and love the trackball. Far better mousemovements it is far easier than the media center keyboard. They even have a model now that has a backlit keyboard which is the only deficiency with my model.
Seriously, check out this site. Here is just one http://www.missingremote.com/review/iogear-gkm571r-24-ghz-multimedia-mini-keyboard. But there are more of them reviewed here.