the name and the appearance of a tiny chip in a fan deck can be very misleading. for instance take benjamin's moore's "driftscape tan" which is neither a driftwood nor a tan, but rather a sickly purple (we could tell it had a purple-ish undertone from the chip, but never expected this. it was worse in person, trust).
you can see that the options of our swatches were quite varied, but several very different options can help one visualize the directions a room can take (there were actually MORE swatches then the selections shown, and in the end, the choice was clear to the client). though it goes against logic, having a clunker in the bunch- like driftscape tan- can help narrow choices in a good way. sometimes having something to react against helps to facilitate a decision for a different color. (remember, there are no mistakes when swatching- it's all gonna get covered up in the end).
so just a timely reminder to swatch, swatch, swatch before you paint, paint, paint, and if you are still in doubt after all that swatching, buy a quart of your favorite swatch or two, and paint a whole wall (don't worry about neatness- that comes once the real painting happens). it will tell you what you need to know before you the go to the time and expense of painting an entire room. a small investment in a quart can save hundreds of dollars in heartache! also, let your paint selections settle for 24 hours before you decide- some paints continue to change color as they dry completely.
last tip, pick your paint color last in your decorating scheme timeline- fabrics and carpets come in limited palettes, but paint is virtually infinite- there is always another color and another company to choose from (which is one of the reasons it can be so damn hard to pick- too many choices!)