Loving the stockalike feel of this mod!
Personally I'd say that the Sentinel Telescope should cover biome scanning and resource scanning, as current space based prospecting technologies use infrared imaging instead of radar. http://earthobservatory.nasa.gov/Features/ASTERProspecting/
Unfortunately, that would leave the M700 with no purpose, unless it would be possible to add a custom resource map for altimetry (which wouldn't be minable) for each celestial body.
As for the narrowband scanner? I'd say it's fine as it is.