That Sentinel is spendy though I don't see to many dropping that much coin on a borderline exploration ship when they can spend half on a DUR a dedicated explorer or about the same coin on a Aquila another dedicated explorer.I am guessing the standard explorer progression in size and capability is going to be 3I5P, Sentinel, Dur, Aquila, Carrack.
Again not a dedicated explorer and not cheap either, plus for me the only armament is manned turrets so finding people to sit in turrets while I explore may be difficult lol.No one has talked about using a Retaliator as an explorer.
Not that other ships can't explore I just think there are two types of explorers, the dedicated kind and the secondary kind, I would purchase a Sent or a Ret for combat use first and exploration as secondary or even a distant third when it comes to priorities. What about the Herald or the Reliant those could easily be converted just range might be an issue.
As for the Cutlass, I say go red, sensors are nice plus would not hurt to have S&R vehicle as well. Not sure what other vehicles you have but the red was my first purchase although since then I have melted it numerous times but I always end up picking it up again, just something about S&R that appeals to me. :P