I use a SpeakerCraft IR Blaster SCIRE50 in conjuction with a RFX9400 extender for my plasma display. Works very well. Detailed description of this product is shown below. It can be purchased from various places online for $31 presently and is even available at certain Best Buy locations for just a couple dollars more which ends up being cheaper as you save on shipping. If you check EBay periodically you'll also find them for even less as seen here.

"The Speakercraft IRE-5.0 IR Blaster is a unique wand-shaped device containing two very high output IR emitters. The Blaster wand is designed in such a fashion as to allow the correct overhang (installer adjusted) for control of a stack of A/V components. It can be mounted above or below the components, or both, to ensure good coverage. It may also be located up to 35 feet opposite the controlled equipment for across the room operation, where conditions permit."