...Im leaning toward the 900at just because of the atu built in, Both are in exceptional condition and more or less same price...
The 7k is a good option but there are a lot of 706's on the air and still working good. I agree though about the price as it is an older rig as is the 900AT.the MKIIg is not even being produced any more. dunno about the 900at.
unless the price is REALLY good, I would look at the IC7k
(most have blown or weak finals)