If you are flying FPV racers, you should definitively use these excellent receiver from FrSky such as the D4R-II.
They offer you up to 1.5km of range (in LOS conditions) and telemetry (Vbat, RSSI) for 5g only (3.5g if you strip stuff). Hard to beat that. Anyway, this receiver is not out of the box perfect, you may have problem if your radio profile use all the 8 available channels. In this case out of the box, you can have some connexion problems. The solution is to flash the “27ms firmware” from FrSky. Unfortunatly, yoo must need the official FrSky serial link. In practice, you can use a simple FTDI device. I did the following video inspired by this following tutorlal: http://diydrones.com/profiles/blogs/frsky-s-cppm-at-27msec-firmware-update-with-ft-prog-and-ftdi-cabl?id=705844%3ABlogPost%3A1001090&page=2
You will need to download the official FrSky firmware at http://www.frsky-rc.com/download/view.php?sort=&down=4&file=D4R-II_CPPM_27mS
You may need a FTDI USB to serial TTL converter: http://www.banggood.com/FT232RL-FTDI-USB-To-TTL-Serial-Converter-Adapter-Module-For-Arduino-p-917226.html
FT252R drivers can be downloaded at:http://www.ftdichip.com/Drivers/VCP.htm
and FT_prog at:http://www.ftdichip.com/Support/Utilities.htm#FT_Prog
Unbricking new non-guenune FTDI device :