The ONLY reason I liked the USB-type better is because I'm lazy and the bluetooth-type requires me to manually link to the PC, but the USB is a simple plug and play.
In addition, you have to buy one of those bluetooth adapters for your HTPC, which is another $15-$30.
A few months ago I was able to find and bought a silver color Logitech PS3 USB keyboard/touchpad for only $30 on amazon!!!
It looks almost exactly like the sleek black one, but it's silver/grey color and about half the price-- and it's USB.
If you can find that one, it would be nice.
So I have both a silver USB Logitech PS3 Keyboard/touchpad and a black bluetooth Logitech PS3 Keyboard/touchpad. I like them both a lot.