I think a lot of us here try to get their in camera result as good as they can get it. However, it will always go wrong somewhere and your LCD is not the best source to trust. In the end, while coming home from a shooting coming to the conclusion you royally screwed up, you only wished you set it to RAW as it will save the day.
I personally believe that once you get the hang of your camera and the way it response to the different situations you are in, a shot in RAW will take you no more than a few clicks of the mouse. Once the processing becomes consistent as well, software likes photoshop allows you to create actions which can be linked to a batch, process a series of shots within a minute.
I agree, at first it's a battle uphill. Once on the top, sit back and relax.
Colorwise, AdobeRGB has the widest color gamut as mentioned here above. In combination with RAW the manipulation is endless and provides the optimal result. Furthermore RAW allows you to control the color temperature very accurately, with a simple move of the slider. Give it a try, good luck!