Hi, Chris,
The AD8370 is one of the widest range digitally controlled differential VGA, but the gain range of 45 dB is still less than your requirement (20 log (7/10m) = 57 dB), so more than one VGA will be needed. Which VGA is the "best" always depends on your application requirements: noise, distortion, max. gain needed, bandwidth (do you really need DC coupling? Offset and drift will be a big issue), source impedance, analog vs. digital gain control, step size, etc. You may be able to reduce output noise by going with a lower input impedance, say, using a 2 k-ohm resistive divider instead of a 1 Mohm 10:1 scope probe. If you can provide more details on your requirements, we may be able to make a more relevant recommendation.
Benjamin
