Go with the icom handheld. They now do a 8.33 version. Also if it is your own plane consider getting an extra com antenna fitted with a cable to a Bnc plug put into the panel or sidewall. You can then connect a handheld to this. This will improve transmission and reception from a hand held which only has a transmit power of 5 watts compared to the 15-25 of most built in radios.