there are many here,-http://www.hobbyking.com/hobbyking/store/uh_listCategoriesAndProducts.asp?catname=FPV&idCategory=316&ParentCat=172 - from 100mw to 1.5watts, 900mhz, 1.2, 2.4, and 5.8 ghz, telemetry can be sent via the audio channel . i believe usa restricts to half watt (500mw), with a directional antenna, u can probably get your desired altitude. i have seen some wifi antenna amplifiers used on 2.4ghz rc radios, boosting the stock (about 60mw) to 1 watt, but this may be illegal in some countries . u may wanna have a look at frsky 2 way communications (frsky-rc.com), i do not think it is enough for video tho, but telemetry, yes.
"Receiver is able to accept serial data streams from simple 3-wire RS232 port, such information as GPS, altitude, and user developed data can be transferred to Tx without error, and sent at the RS232 port on the Tx." at 11bit