Hey Steve,
Frankly, I'm surprised a standard RF mouse is working
at all at 15 to 20 feet. You're definitely going to have to go Bluetooth which has a range of 30 feet. Unless, that is, you're able to use an extention cable to get the transceiver closer to your work area.
I have a PC included in my plasma setup. It's not a true HTPC, but I still needed the range from the bluetooth. I'm using the
Logitech Cordless Desktop MX for Bluetooth and it works great but it's a bit pricey. I can stand all the way back at my kitchen counter which is right at about 30 feet from where the receiver is and I get great response.
I had a problem installing mine initially because there was no mouse
or keyboard response after rebooting when I first installed the software so keep a standard mouse or KB handy. I had to shut down using the power switch (safe enough if power management is enabled) and connect a standard mouse to finish the Logitech software installation. Other than jumping through that particular hoop on the install it works great.
I just noticed the "I Wish" response to the Bluetooth question before mine. Since you're looking for a combo anyway, why wouldn't you be able to use Bluetooth?