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I think your best bet would be to go for a philips (ex plessey) kind of chip.
A TSA5055 for example you easily get you up to 2.4 ghz.
I2C control is easy to implement using i AVR or PIC series of mcu's.
Also,, there are plenty of homebrewed circuits including files for the mcu's at most of the amatuer atv sites.